diff --git a/contrib/json_spirit/json_spirit.h b/contrib/json_spirit/json_spirit.h
new file mode 100644
index 0000000..d574af5
--- /dev/null
+++ b/contrib/json_spirit/json_spirit.h
@@ -0,0 +1,18 @@
+#ifndef JSON_SPIRIT
+#define JSON_SPIRIT
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include "json_spirit_value.h"
+#include "json_spirit_reader.h"
+#include "json_spirit_writer.h"
+#include "json_spirit_utils.h"
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_error_position.h b/contrib/json_spirit/json_spirit_error_position.h
new file mode 100644
index 0000000..e6f63bb
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_error_position.h
@@ -0,0 +1,54 @@
+#ifndef JSON_SPIRIT_ERROR_POSITION
+#define JSON_SPIRIT_ERROR_POSITION
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <string>
+
+namespace json_spirit
+{
+    // An Error_position exception is thrown by the "read_or_throw" functions below on finding an error.
+    // Note the "read_or_throw" functions are around 3 times slower than the standard functions "read" 
+    // functions that return a bool.
+    //
+    struct Error_position
+    {
+        Error_position();
+        Error_position( unsigned int line, unsigned int column, const std::string& reason );
+        bool operator==( const Error_position& lhs ) const;
+        unsigned int line_;
+        unsigned int column_;
+        std::string reason_;
+    };
+
+    inline Error_position::Error_position()
+    :   line_( 0 )
+    ,   column_( 0 )
+    {
+    }
+
+    inline Error_position::Error_position( unsigned int line, unsigned int column, const std::string& reason )
+    :   line_( line )
+    ,   column_( column )
+    ,   reason_( reason )
+    {
+    }
+
+    inline bool Error_position::operator==( const Error_position& lhs ) const
+    {
+        if( this == &lhs ) return true;
+
+        return ( reason_ == lhs.reason_ ) &&
+               ( line_   == lhs.line_ ) &&
+               ( column_ == lhs.column_ ); 
+    }
+}
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_reader.h b/contrib/json_spirit/json_spirit_reader.h
new file mode 100644
index 0000000..e8caa8f
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_reader.h
@@ -0,0 +1,62 @@
+#ifndef JSON_SPIRIT_READER
+#define JSON_SPIRIT_READER
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include "json_spirit_value.h"
+#include "json_spirit_error_position.h"
+#include <iostream>
+
+namespace json_spirit
+{
+    // functions to reads a JSON values
+
+#ifdef JSON_SPIRIT_VALUE_ENABLED
+    bool read( const std::string& s, Value& value );
+    bool read( std::istream& is,     Value& value );
+    bool read( std::string::const_iterator& begin, std::string::const_iterator end, Value& value );
+
+    void read_or_throw( const std::string& s, Value& value );  
+    void read_or_throw( std::istream& is,     Value& value );
+    void read_or_throw( std::string::const_iterator& begin, std::string::const_iterator end, Value& value );
+#endif
+
+#if defined( JSON_SPIRIT_WVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    bool read( const std::wstring& s, wValue& value );
+    bool read( std::wistream&  is,    wValue& value );
+    bool read( std::wstring::const_iterator& begin, std::wstring::const_iterator end, wValue& value );    
+
+    void read_or_throw( const std::wstring& s, wValue& value );
+    void read_or_throw( std::wistream& is,     wValue& value );
+    void read_or_throw( std::wstring::const_iterator& begin, std::wstring::const_iterator end, wValue& value );
+#endif
+
+#ifdef JSON_SPIRIT_MVALUE_ENABLED
+    bool read( const std::string& s, mValue& value );
+    bool read( std::istream& is,     mValue& value );
+    bool read( std::string::const_iterator& begin, std::string::const_iterator end, mValue& value );
+
+    void read_or_throw( const std::string& s, mValue& value );  
+    void read_or_throw( std::istream& is,     mValue& value );
+    void read_or_throw( std::string::const_iterator& begin, std::string::const_iterator end, mValue& value );
+#endif
+
+#if defined( JSON_SPIRIT_WMVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    bool read( const std::wstring& s, wmValue& value );
+    bool read( std::wistream& is,     wmValue& value );
+    bool read( std::wstring::const_iterator& begin, std::wstring::const_iterator end, wmValue& value );    
+
+    void read_or_throw( const std::wstring& s, wmValue& value );
+    void read_or_throw( std::wistream& is,     wmValue& value );
+    void read_or_throw( std::wstring::const_iterator& begin, std::wstring::const_iterator end, wmValue& value );
+#endif
+}
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_reader_template.h b/contrib/json_spirit/json_spirit_reader_template.h
new file mode 100644
index 0000000..93f64e4
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_reader_template.h
@@ -0,0 +1,648 @@
+#ifndef JSON_SPIRIT_READER_TEMPLATE
+#define JSON_SPIRIT_READER_TEMPLATE
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include "json_spirit_value.h"
+#include "json_spirit_error_position.h"
+
+//#define BOOST_SPIRIT_THREADSAFE  // uncomment for multithreaded use, requires linking to boost.thread
+
+#include <boost/bind.hpp>
+#include <boost/function.hpp>
+#include <boost/version.hpp>
+
+#if BOOST_VERSION >= 103800
+    #include <boost/spirit/include/classic_core.hpp>
+    #include <boost/spirit/include/classic_confix.hpp>
+    #include <boost/spirit/include/classic_escape_char.hpp>
+    #include <boost/spirit/include/classic_multi_pass.hpp>
+    #include <boost/spirit/include/classic_position_iterator.hpp>
+    #define spirit_namespace boost::spirit::classic
+#else
+    #include <boost/spirit/core.hpp>
+    #include <boost/spirit/utility/confix.hpp>
+    #include <boost/spirit/utility/escape_char.hpp>
+    #include <boost/spirit/iterator/multi_pass.hpp>
+    #include <boost/spirit/iterator/position_iterator.hpp>
+    #define spirit_namespace boost::spirit
+#endif
+
+namespace json_spirit
+{
+    const spirit_namespace::int_parser < boost::int64_t >  int64_p  = spirit_namespace::int_parser < boost::int64_t  >();
+    const spirit_namespace::uint_parser< boost::uint64_t > uint64_p = spirit_namespace::uint_parser< boost::uint64_t >();
+
+    template< class Iter_type >
+    bool is_eq( Iter_type first, Iter_type last, const char* c_str )
+    {
+        for( Iter_type i = first; i != last; ++i, ++c_str )
+        {
+            if( *c_str == 0 ) return false;
+
+            if( *i != *c_str ) return false;
+        }
+
+        return true;
+    }
+
+    template< class Char_type >
+    Char_type hex_to_num( const Char_type c )
+    {
+        if( ( c >= '0' ) && ( c <= '9' ) ) return c - '0';
+        if( ( c >= 'a' ) && ( c <= 'f' ) ) return c - 'a' + 10;
+        if( ( c >= 'A' ) && ( c <= 'F' ) ) return c - 'A' + 10;
+        return 0;
+    }
+
+    template< class Char_type, class Iter_type >
+    Char_type hex_str_to_char( Iter_type& begin )
+    {
+        const Char_type c1( *( ++begin ) );
+        const Char_type c2( *( ++begin ) );
+
+        return ( hex_to_num( c1 ) << 4 ) + hex_to_num( c2 );
+    }       
+
+    template< class Char_type, class Iter_type >
+    Char_type unicode_str_to_char( Iter_type& begin )
+    {
+        const Char_type c1( *( ++begin ) );
+        const Char_type c2( *( ++begin ) );
+        const Char_type c3( *( ++begin ) );
+        const Char_type c4( *( ++begin ) );
+
+        return ( hex_to_num( c1 ) << 12 ) + 
+               ( hex_to_num( c2 ) <<  8 ) + 
+               ( hex_to_num( c3 ) <<  4 ) + 
+               hex_to_num( c4 );
+    }
+
+    template< class String_type >
+    void append_esc_char_and_incr_iter( String_type& s, 
+                                        typename String_type::const_iterator& begin, 
+                                        typename String_type::const_iterator end )
+    {
+        typedef typename String_type::value_type Char_type;
+             
+        const Char_type c2( *begin );
+
+        switch( c2 )
+        {
+            case 't':  s += '\t'; break;
+            case 'b':  s += '\b'; break;
+            case 'f':  s += '\f'; break;
+            case 'n':  s += '\n'; break;
+            case 'r':  s += '\r'; break;
+            case '\\': s += '\\'; break;
+            case '/':  s += '/';  break;
+            case '"':  s += '"';  break;
+            case 'x':  
+            {
+                if( end - begin >= 3 )  //  expecting "xHH..."
+                {
+                    s += hex_str_to_char< Char_type >( begin );  
+                }
+                break;
+            }
+            case 'u':  
+            {
+                if( end - begin >= 5 )  //  expecting "uHHHH..."
+                {
+                    s += unicode_str_to_char< Char_type >( begin );  
+                }
+                break;
+            }
+        }
+    }
+
+    template< class String_type >
+    String_type substitute_esc_chars( typename String_type::const_iterator begin, 
+                                   typename String_type::const_iterator end )
+    {
+        typedef typename String_type::const_iterator Iter_type;
+
+        if( end - begin < 2 ) return String_type( begin, end );
+
+        String_type result;
+        
+        result.reserve( end - begin );
+
+        const Iter_type end_minus_1( end - 1 );
+
+        Iter_type substr_start = begin;
+        Iter_type i = begin;
+
+        for( ; i < end_minus_1; ++i )
+        {
+            if( *i == '\\' )
+            {
+                result.append( substr_start, i );
+
+                ++i;  // skip the '\'
+             
+                append_esc_char_and_incr_iter( result, i, end );
+
+                substr_start = i + 1;
+            }
+        }
+
+        result.append( substr_start, end );
+
+        return result;
+    }
+
+    template< class String_type >
+    String_type get_str_( typename String_type::const_iterator begin, 
+                       typename String_type::const_iterator end )
+    {
+        assert( end - begin >= 2 );
+
+        typedef typename String_type::const_iterator Iter_type;
+
+        Iter_type str_without_quotes( ++begin );
+        Iter_type end_without_quotes( --end );
+
+        return substitute_esc_chars< String_type >( str_without_quotes, end_without_quotes );
+    }
+
+    inline std::string get_str( std::string::const_iterator begin, std::string::const_iterator end )
+    {
+        return get_str_< std::string >( begin, end );
+    }
+
+    inline std::wstring get_str( std::wstring::const_iterator begin, std::wstring::const_iterator end )
+    {
+        return get_str_< std::wstring >( begin, end );
+    }
+    
+    template< class String_type, class Iter_type >
+    String_type get_str( Iter_type begin, Iter_type end )
+    {
+        const String_type tmp( begin, end );  // convert multipass iterators to string iterators
+
+        return get_str( tmp.begin(), tmp.end() );
+    }
+
+    // this class's methods get called by the spirit parse resulting
+    // in the creation of a JSON object or array
+    //
+    // NB Iter_type could be a std::string iterator, wstring iterator, a position iterator or a multipass iterator
+    //
+    template< class Value_type, class Iter_type >
+    class Semantic_actions 
+    {
+    public:
+
+        typedef typename Value_type::Config_type Config_type;
+        typedef typename Config_type::String_type String_type;
+        typedef typename Config_type::Object_type Object_type;
+        typedef typename Config_type::Array_type Array_type;
+        typedef typename String_type::value_type Char_type;
+
+        Semantic_actions( Value_type& value )
+        :   value_( value )
+        ,   current_p_( 0 )
+        {
+        }
+
+        void begin_obj( Char_type c )
+        {
+            assert( c == '{' );
+
+            begin_compound< Object_type >();
+        }
+
+        void end_obj( Char_type c )
+        {
+            assert( c == '}' );
+
+            end_compound();
+        }
+
+        void begin_array( Char_type c )
+        {
+            assert( c == '[' );
+     
+            begin_compound< Array_type >();
+        }
+
+        void end_array( Char_type c )
+        {
+            assert( c == ']' );
+
+            end_compound();
+        }
+
+        void new_name( Iter_type begin, Iter_type end )
+        {
+            assert( current_p_->type() == obj_type );
+
+            name_ = get_str< String_type >( begin, end );
+        }
+
+        void new_str( Iter_type begin, Iter_type end )
+        {
+            add_to_current( get_str< String_type >( begin, end ) );
+        }
+
+        void new_true( Iter_type begin, Iter_type end )
+        {
+            assert( is_eq( begin, end, "true" ) );
+
+            add_to_current( true );
+        }
+
+        void new_false( Iter_type begin, Iter_type end )
+        {
+            assert( is_eq( begin, end, "false" ) );
+
+            add_to_current( false );
+        }
+
+        void new_null( Iter_type begin, Iter_type end )
+        {
+            assert( is_eq( begin, end, "null" ) );
+
+            add_to_current( Value_type() );
+        }
+
+        void new_int( boost::int64_t i )
+        {
+            add_to_current( i );
+        }
+
+        void new_uint64( boost::uint64_t ui )
+        {
+            add_to_current( ui );
+        }
+
+        void new_real( double d )
+        {
+            add_to_current( d );
+        }
+
+    private:
+
+        Semantic_actions& operator=( const Semantic_actions& ); 
+                                    // to prevent "assignment operator could not be generated" warning
+
+        Value_type* add_first( const Value_type& value )
+        {
+            assert( current_p_ == 0 );
+
+            value_ = value;
+            current_p_ = &value_;
+            return current_p_;
+        }
+
+        template< class Array_or_obj >
+        void begin_compound()
+        {
+            if( current_p_ == 0 )
+            {
+                add_first( Array_or_obj() );
+            }
+            else
+            {
+                stack_.push_back( current_p_ );
+
+                Array_or_obj new_array_or_obj;   // avoid copy by building new array or object in place
+
+                current_p_ = add_to_current( new_array_or_obj );
+            }
+        }
+
+        void end_compound()
+        {
+            if( current_p_ != &value_ )
+            {
+                current_p_ = stack_.back();
+                
+                stack_.pop_back();
+            }    
+        }
+
+        Value_type* add_to_current( const Value_type& value )
+        {
+            if( current_p_ == 0 )
+            {
+                return add_first( value );
+            }
+            else if( current_p_->type() == array_type )
+            {
+                current_p_->get_array().push_back( value );
+
+                return &current_p_->get_array().back(); 
+            }
+            
+            assert( current_p_->type() == obj_type );
+
+            return &Config_type::add( current_p_->get_obj(), name_, value );
+        }
+
+        Value_type& value_;             // this is the object or array that is being created
+        Value_type* current_p_;         // the child object or array that is currently being constructed
+
+        std::vector< Value_type* > stack_;   // previous child objects and arrays
+
+        String_type name_;              // of current name/value pair
+    };
+
+    template< typename Iter_type >
+    void throw_error( spirit_namespace::position_iterator< Iter_type > i, const std::string& reason )
+    {
+        throw Error_position( i.get_position().line, i.get_position().column, reason );
+    }
+
+    template< typename Iter_type >
+    void throw_error( Iter_type i, const std::string& reason )
+    {
+       throw reason;
+    }
+
+    // the spirit grammer 
+    //
+    template< class Value_type, class Iter_type >
+    class Json_grammer : public spirit_namespace::grammar< Json_grammer< Value_type, Iter_type > >
+    {
+    public:
+
+        typedef Semantic_actions< Value_type, Iter_type > Semantic_actions_t;
+
+        Json_grammer( Semantic_actions_t& semantic_actions )
+        :   actions_( semantic_actions )
+        {
+        }
+
+        static void throw_not_value( Iter_type begin, Iter_type end )
+        {
+    	    throw_error( begin, "not a value" );
+        }
+
+        static void throw_not_array( Iter_type begin, Iter_type end )
+        {
+    	    throw_error( begin, "not an array" );
+        }
+
+        static void throw_not_object( Iter_type begin, Iter_type end )
+        {
+    	    throw_error( begin, "not an object" );
+        }
+
+        static void throw_not_pair( Iter_type begin, Iter_type end )
+        {
+    	    throw_error( begin, "not a pair" );
+        }
+
+        static void throw_not_colon( Iter_type begin, Iter_type end )
+        {
+    	    throw_error( begin, "no colon in pair" );
+        }
+
+        static void throw_not_string( Iter_type begin, Iter_type end )
+        {
+    	    throw_error( begin, "not a string" );
+        }
+
+        template< typename ScannerT >
+        class definition
+        {
+        public:
+
+            definition( const Json_grammer& self )
+            {
+                using namespace spirit_namespace;
+
+                typedef typename Value_type::String_type::value_type Char_type;
+
+                // first we convert the semantic action class methods to functors with the 
+                // parameter signature expected by spirit
+
+                typedef boost::function< void( Char_type )            > Char_action;
+                typedef boost::function< void( Iter_type, Iter_type ) > Str_action;
+                typedef boost::function< void( double )               > Real_action;
+                typedef boost::function< void( boost::int64_t )       > Int_action;
+                typedef boost::function< void( boost::uint64_t )      > Uint64_action;
+
+                Char_action   begin_obj  ( boost::bind( &Semantic_actions_t::begin_obj,   &self.actions_, _1 ) );
+                Char_action   end_obj    ( boost::bind( &Semantic_actions_t::end_obj,     &self.actions_, _1 ) );
+                Char_action   begin_array( boost::bind( &Semantic_actions_t::begin_array, &self.actions_, _1 ) );
+                Char_action   end_array  ( boost::bind( &Semantic_actions_t::end_array,   &self.actions_, _1 ) );
+                Str_action    new_name   ( boost::bind( &Semantic_actions_t::new_name,    &self.actions_, _1, _2 ) );
+                Str_action    new_str    ( boost::bind( &Semantic_actions_t::new_str,     &self.actions_, _1, _2 ) );
+                Str_action    new_true   ( boost::bind( &Semantic_actions_t::new_true,    &self.actions_, _1, _2 ) );
+                Str_action    new_false  ( boost::bind( &Semantic_actions_t::new_false,   &self.actions_, _1, _2 ) );
+                Str_action    new_null   ( boost::bind( &Semantic_actions_t::new_null,    &self.actions_, _1, _2 ) );
+                Real_action   new_real   ( boost::bind( &Semantic_actions_t::new_real,    &self.actions_, _1 ) );
+                Int_action    new_int    ( boost::bind( &Semantic_actions_t::new_int,     &self.actions_, _1 ) );
+                Uint64_action new_uint64 ( boost::bind( &Semantic_actions_t::new_uint64,  &self.actions_, _1 ) );
+
+                // actual grammer
+
+                json_
+                    = value_ | eps_p[ &throw_not_value ]
+                    ;
+
+                value_
+                    = string_[ new_str ] 
+                    | number_ 
+                    | object_ 
+                    | array_ 
+                    | str_p( "true" ) [ new_true  ] 
+                    | str_p( "false" )[ new_false ] 
+                    | str_p( "null" ) [ new_null  ]
+                    ;
+
+                object_ 
+                    = ch_p('{')[ begin_obj ]
+                    >> !members_
+                    >> ( ch_p('}')[ end_obj ] | eps_p[ &throw_not_object ] )
+                    ;
+
+                members_
+                    = pair_ >> *( ',' >> pair_ )
+                    ;
+
+                pair_
+                    = string_[ new_name ]
+                    >> ( ':' | eps_p[ &throw_not_colon ] )
+                    >> ( value_ | eps_p[ &throw_not_value ] )
+                    ;
+
+                array_
+                    = ch_p('[')[ begin_array ]
+                    >> !elements_
+                    >> ( ch_p(']')[ end_array ] | eps_p[ &throw_not_array ] )
+                    ;
+
+                elements_
+                    = value_ >> *( ',' >> value_ )
+                    ;
+
+                string_ 
+                    = lexeme_d // this causes white space inside a string to be retained
+                      [
+                          confix_p
+                          ( 
+                              '"', 
+                              *lex_escape_ch_p,
+                              '"'
+                          ) 
+                      ]
+                    ;
+
+                number_
+                    = strict_real_p[ new_real   ] 
+                    | int64_p      [ new_int    ]
+                    | uint64_p     [ new_uint64 ]
+                    ;
+            }
+
+            spirit_namespace::rule< ScannerT > json_, object_, members_, pair_, array_, elements_, value_, string_, number_;
+
+            const spirit_namespace::rule< ScannerT >& start() const { return json_; }
+        };
+
+    private:
+
+        Json_grammer& operator=( const Json_grammer& ); // to prevent "assignment operator could not be generated" warning
+
+        Semantic_actions_t& actions_;
+    };
+
+    template< class Iter_type, class Value_type >
+    void add_posn_iter_and_read_range_or_throw( Iter_type begin, Iter_type end, Value_type& value )
+    {
+        typedef spirit_namespace::position_iterator< Iter_type > Posn_iter_t;
+
+        const Posn_iter_t posn_begin( begin, end );
+        const Posn_iter_t posn_end( end, end );
+     
+        read_range_or_throw( posn_begin, posn_end, value );
+    }
+
+    template< class Istream_type >
+    struct Multi_pass_iters
+    {
+        typedef typename Istream_type::char_type Char_type;
+        typedef std::istream_iterator< Char_type, Char_type > istream_iter;
+        typedef spirit_namespace::multi_pass< istream_iter > Mp_iter;
+
+        Multi_pass_iters( Istream_type& is )
+        {
+            is.unsetf( std::ios::skipws );
+
+            begin_ = spirit_namespace::make_multi_pass( istream_iter( is ) );
+            end_   = spirit_namespace::make_multi_pass( istream_iter() );
+        }
+
+        Mp_iter begin_;
+        Mp_iter end_;
+    };
+
+    // reads a JSON Value from a pair of input iterators throwing an exception on invalid input, e.g.
+    //
+    // string::const_iterator start = str.begin();
+    // const string::const_iterator next = read_range_or_throw( str.begin(), str.end(), value );
+    //
+    // The iterator 'next' will point to the character past the 
+    // last one read.
+    //
+    template< class Iter_type, class Value_type >
+    Iter_type read_range_or_throw( Iter_type begin, Iter_type end, Value_type& value )
+    {
+        Semantic_actions< Value_type, Iter_type > semantic_actions( value );
+     
+        const spirit_namespace::parse_info< Iter_type > info = 
+                            spirit_namespace::parse( begin, end, 
+                                                    Json_grammer< Value_type, Iter_type >( semantic_actions ), 
+                                                    spirit_namespace::space_p );
+
+        if( !info.hit )
+        {
+            assert( false ); // in theory exception should already have been thrown
+            throw_error( info.stop, "error" );
+        }
+
+        return info.stop;
+    }
+
+    // reads a JSON Value from a pair of input iterators, e.g.
+    //
+    // string::const_iterator start = str.begin();
+    // const bool success = read_string( start, str.end(), value );
+    //
+    // The iterator 'start' will point to the character past the 
+    // last one read.
+    //
+    template< class Iter_type, class Value_type >
+    bool read_range( Iter_type& begin, Iter_type end, Value_type& value )
+    {
+        try
+        {
+            begin = read_range_or_throw( begin, end, value );
+
+            return true;
+        }
+        catch( ... )
+        {
+            return false;
+        }
+    }
+
+    // reads a JSON Value from a string, e.g.
+    //
+    // const bool success = read_string( str, value );
+    //
+    template< class String_type, class Value_type >
+    bool read_string( const String_type& s, Value_type& value )
+    {
+        typename String_type::const_iterator begin = s.begin();
+
+        return read_range( begin, s.end(), value );
+    }
+
+    // reads a JSON Value from a string throwing an exception on invalid input, e.g.
+    //
+    // read_string_or_throw( is, value );
+    //
+    template< class String_type, class Value_type >
+    void read_string_or_throw( const String_type& s, Value_type& value )
+    {
+        add_posn_iter_and_read_range_or_throw( s.begin(), s.end(), value );
+    }
+
+    // reads a JSON Value from a stream, e.g.
+    //
+    // const bool success = read_stream( is, value );
+    //
+    template< class Istream_type, class Value_type >
+    bool read_stream( Istream_type& is, Value_type& value )
+    {
+        Multi_pass_iters< Istream_type > mp_iters( is );
+
+        return read_range( mp_iters.begin_, mp_iters.end_, value );
+    }
+
+    // reads a JSON Value from a stream throwing an exception on invalid input, e.g.
+    //
+    // read_stream_or_throw( is, value );
+    //
+    template< class Istream_type, class Value_type >
+    void read_stream_or_throw( Istream_type& is, Value_type& value )
+    {
+        const Multi_pass_iters< Istream_type > mp_iters( is );
+
+        add_posn_iter_and_read_range_or_throw( mp_iters.begin_, mp_iters.end_, value );
+    }
+}
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_stream_reader.h b/contrib/json_spirit/json_spirit_stream_reader.h
new file mode 100644
index 0000000..916725c
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_stream_reader.h
@@ -0,0 +1,70 @@
+#ifndef JSON_SPIRIT_READ_STREAM
+#define JSON_SPIRIT_READ_STREAM
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include "json_spirit_reader_template.h"
+
+namespace json_spirit
+{
+    // these classes allows you to read multiple top level contiguous values from a stream,
+    // the normal stream read functions have a bug that prevent multiple top level values 
+    // from being read unless they are separated by spaces
+
+    template< class Istream_type, class Value_type >
+    class Stream_reader
+    {
+    public:
+
+        Stream_reader( Istream_type& is )
+        :   iters_( is )
+        {
+        }
+
+        bool read_next( Value_type& value )
+        {
+            return read_range( iters_.begin_, iters_.end_, value );
+        }
+
+    private:
+
+        typedef Multi_pass_iters< Istream_type > Mp_iters;
+
+        Mp_iters iters_;
+    };
+
+    template< class Istream_type, class Value_type >
+    class Stream_reader_thrower
+    {
+    public:
+
+        Stream_reader_thrower( Istream_type& is )
+        :   iters_( is )
+        ,    posn_begin_( iters_.begin_, iters_.end_ )
+        ,    posn_end_( iters_.end_, iters_.end_ )
+        {
+        }
+
+        void read_next( Value_type& value )
+        {
+            posn_begin_ = read_range_or_throw( posn_begin_, posn_end_, value );
+        }
+
+    private:
+
+        typedef Multi_pass_iters< Istream_type > Mp_iters;
+        typedef spirit_namespace::position_iterator< typename Mp_iters::Mp_iter > Posn_iter_t;
+
+        Mp_iters iters_;
+        Posn_iter_t posn_begin_, posn_end_;
+    };
+}
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_utils.h b/contrib/json_spirit/json_spirit_utils.h
new file mode 100644
index 0000000..c492309
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_utils.h
@@ -0,0 +1,63 @@
+#ifndef JSON_SPIRIT_UTILS
+#define JSON_SPIRIT_UTILS
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include "json_spirit_value.h"
+#include <map>
+
+namespace json_spirit
+{ 
+    template< class Obj_t, class Map_t >
+    void obj_to_map( const Obj_t& obj, Map_t& mp_obj )
+    {
+        mp_obj.clear();
+
+        for( typename Obj_t::const_iterator i = obj.begin(); i != obj.end(); ++i )
+        {
+            mp_obj[ i->name_ ] = i->value_;
+        }
+    }
+
+    template< class Obj_t, class Map_t >
+    void map_to_obj( const Map_t& mp_obj, Obj_t& obj )
+    {
+        obj.clear();
+
+        for( typename Map_t::const_iterator i = mp_obj.begin(); i != mp_obj.end(); ++i )
+        {
+            obj.push_back( typename Obj_t::value_type( i->first, i->second ) );
+        }
+    }
+
+#ifdef JSON_SPIRIT_VALUE_ENABLED
+    typedef std::map< std::string, Value > Mapped_obj;
+#endif
+
+#if defined( JSON_SPIRIT_WVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    typedef std::map< std::wstring, wValue > wMapped_obj;
+#endif
+
+    template< class Object_type, class String_type >
+    const typename Object_type::value_type::Value_type& find_value( const Object_type& obj, const String_type& name )
+    {
+        for( typename Object_type::const_iterator i = obj.begin(); i != obj.end(); ++i )
+        {
+            if( i->name_ == name )
+            {
+                return i->value_;
+            }
+        }
+
+        return Object_type::value_type::Value_type::null;
+    }
+}
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_value.h b/contrib/json_spirit/json_spirit_value.h
new file mode 100644
index 0000000..8ccbef4
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_value.h
@@ -0,0 +1,585 @@
+#ifndef JSON_SPIRIT_VALUE
+#define JSON_SPIRIT_VALUE
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <vector>
+#include <map>
+#include <string>
+#include <cassert>
+#include <sstream>
+#include <stdexcept>
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/variant.hpp>
+
+// comment out the value types you don't need to reduce build times and intermediate file sizes
+#define JSON_SPIRIT_VALUE_ENABLED
+#define JSON_SPIRIT_WVALUE_ENABLED
+#define JSON_SPIRIT_MVALUE_ENABLED
+#define JSON_SPIRIT_WMVALUE_ENABLED
+
+namespace json_spirit
+{
+    enum Value_type{ obj_type, array_type, str_type, bool_type, int_type, real_type, null_type };
+
+    struct Null{};
+
+    template< class Config >    // Config determines whether the value uses std::string or std::wstring and
+                                // whether JSON Objects are represented as vectors or maps
+    class Value_impl
+    {
+    public:
+
+        typedef Config Config_type;
+        typedef typename Config::String_type String_type;
+        typedef typename Config::Object_type Object;
+        typedef typename Config::Array_type Array;
+        typedef typename String_type::const_pointer Const_str_ptr;  // eg const char*
+
+        Value_impl();  // creates null value
+        Value_impl( Const_str_ptr      value );
+        Value_impl( const String_type& value );
+        Value_impl( const Object&      value );
+        Value_impl( const Array&       value );
+        Value_impl( bool               value );
+        Value_impl( int                value );
+        Value_impl( boost::int64_t     value );
+        Value_impl( boost::uint64_t    value );
+        Value_impl( double             value );
+
+        template< class Iter >
+        Value_impl( Iter first, Iter last );    // constructor from containers, e.g. std::vector or std::list
+
+        template< BOOST_VARIANT_ENUM_PARAMS( typename T ) >
+        Value_impl( const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& variant ); // constructor for compatible variant types
+
+        Value_impl( const Value_impl& other );
+
+        bool operator==( const Value_impl& lhs ) const;
+
+        Value_impl& operator=( const Value_impl& lhs );
+
+        Value_type type() const;
+
+        bool is_uint64() const;
+        bool is_null() const;
+
+        const String_type& get_str()    const;
+        const Object&      get_obj()    const;
+        const Array&       get_array()  const;
+        bool               get_bool()   const;
+        int                get_int()    const;
+        boost::int64_t     get_int64()  const;
+        boost::uint64_t    get_uint64() const;
+        double             get_real()   const;
+
+        Object& get_obj();
+        Array&  get_array();
+
+        template< typename T > T get_value() const;  // example usage: int    i = value.get_value< int >();
+                                                     // or             double d = value.get_value< double >();
+
+        static const Value_impl null;
+
+    private:
+
+        void check_type( const Value_type vtype ) const;
+
+        typedef boost::variant< boost::recursive_wrapper< Object >, boost::recursive_wrapper< Array >,
+                                String_type, bool, boost::int64_t, double, Null, boost::uint64_t > Variant;
+
+        Variant v_;
+
+        class Variant_converter_visitor : public boost::static_visitor< Variant >
+        {
+        public:
+
+              template< typename T, typename A, template< typename, typename > class Cont >
+              Variant operator()( const Cont< T, A >& cont ) const
+              {
+                  return Array( cont.begin(), cont.end() );
+              }
+
+              Variant operator()( int i ) const
+              {
+                  return static_cast< boost::int64_t >( i );
+              }
+
+              template<class T>
+              Variant operator()( const T& t ) const
+              {
+                  return t;
+              }
+        };
+    };
+
+    // vector objects
+
+    template< class Config >
+    struct Pair_impl
+    {
+        typedef typename Config::String_type String_type;
+        typedef typename Config::Value_type Value_type;
+
+        Pair_impl()
+        {
+        }
+
+        Pair_impl( const String_type& name, const Value_type& value );
+
+        bool operator==( const Pair_impl& lhs ) const;
+
+        String_type name_;
+        Value_type value_;
+    };
+
+#if defined( JSON_SPIRIT_VALUE_ENABLED ) || defined( JSON_SPIRIT_WVALUE_ENABLED )
+    template< class String >
+    struct Config_vector
+    {
+        typedef String String_type;
+        typedef Value_impl< Config_vector > Value_type;
+        typedef Pair_impl < Config_vector > Pair_type;
+        typedef std::vector< Value_type > Array_type;
+        typedef std::vector< Pair_type > Object_type;
+
+        static Value_type& add( Object_type& obj, const String_type& name, const Value_type& value )
+        {
+            obj.push_back( Pair_type( name , value ) );
+
+            return obj.back().value_;
+        }
+
+        static String_type get_name( const Pair_type& pair )
+        {
+            return pair.name_;
+        }
+
+        static Value_type get_value( const Pair_type& pair )
+        {
+            return pair.value_;
+        }
+    };
+#endif
+
+    // typedefs for ASCII
+
+#ifdef JSON_SPIRIT_VALUE_ENABLED
+    typedef Config_vector< std::string > Config;
+
+    typedef Config::Value_type  Value;
+    typedef Config::Pair_type   Pair;
+    typedef Config::Object_type Object;
+    typedef Config::Array_type  Array;
+#endif
+
+    // typedefs for Unicode
+
+#if defined( JSON_SPIRIT_WVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    typedef Config_vector< std::wstring > wConfig;
+
+    typedef wConfig::Value_type  wValue;
+    typedef wConfig::Pair_type   wPair;
+    typedef wConfig::Object_type wObject;
+    typedef wConfig::Array_type  wArray;
+#endif
+
+    // map objects
+
+#if defined( JSON_SPIRIT_MVALUE_ENABLED ) || defined( JSON_SPIRIT_WMVALUE_ENABLED )
+    template< class String >
+    struct Config_map
+    {
+        typedef String String_type;
+        typedef Value_impl< Config_map > Value_type;
+        typedef std::vector< Value_type > Array_type;
+        typedef std::map< String_type, Value_type > Object_type;
+        typedef std::pair< String_type, Value_type > Pair_type;
+
+        static Value_type& add( Object_type& obj, const String_type& name, const Value_type& value )
+        {
+            return obj[ name ] = value;
+        }
+
+        static String_type get_name( const Pair_type& pair )
+        {
+            return pair.first;
+        }
+
+        static Value_type get_value( const Pair_type& pair )
+        {
+            return pair.second;
+        }
+    };
+#endif
+
+    // typedefs for ASCII
+
+#ifdef JSON_SPIRIT_MVALUE_ENABLED
+    typedef Config_map< std::string > mConfig;
+
+    typedef mConfig::Value_type  mValue;
+    typedef mConfig::Object_type mObject;
+    typedef mConfig::Array_type  mArray;
+#endif
+
+    // typedefs for Unicode
+
+#if defined( JSON_SPIRIT_WMVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    typedef Config_map< std::wstring > wmConfig;
+
+    typedef wmConfig::Value_type  wmValue;
+    typedef wmConfig::Object_type wmObject;
+    typedef wmConfig::Array_type  wmArray;
+#endif
+
+    ///////////////////////////////////////////////////////////////////////////////////////////////
+    //
+    // implementation
+
+    inline bool operator==( const Null&, const Null& )
+    {
+        return true;
+    }
+
+    template< class Config >
+    const Value_impl< Config > Value_impl< Config >::null;
+
+    template< class Config >
+    Value_impl< Config >::Value_impl()
+    :   v_( Null() )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( const Const_str_ptr value )
+    :  v_( String_type( value ) )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( const String_type& value )
+    :   v_( value )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( const Object& value )
+    :   v_( value )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( const Array& value )
+    :   v_( value )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( bool value )
+    :   v_( value )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( int value )
+    :   v_( static_cast< boost::int64_t >( value ) )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( boost::int64_t value )
+    :   v_( value )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( boost::uint64_t value )
+    :   v_( value )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( double value )
+    :   v_( value )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >::Value_impl( const Value_impl< Config >& other )
+    :   v_( other.v_ )
+    {
+    }
+
+    template< class Config >
+    template< class Iter >
+    Value_impl< Config >::Value_impl( Iter first, Iter last )
+    :   v_( Array( first, last ) )
+    {
+    }
+
+    template< class Config >
+    template< BOOST_VARIANT_ENUM_PARAMS( typename T ) >
+    Value_impl< Config >::Value_impl( const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& variant )
+    :   v_( boost::apply_visitor( Variant_converter_visitor(), variant) )
+    {
+    }
+
+    template< class Config >
+    Value_impl< Config >& Value_impl< Config >::operator=( const Value_impl& lhs )
+    {
+        Value_impl tmp( lhs );
+
+        std::swap( v_, tmp.v_ );
+
+        return *this;
+    }
+
+    template< class Config >
+    bool Value_impl< Config >::operator==( const Value_impl& lhs ) const
+    {
+        if( this == &lhs ) return true;
+
+        if( type() != lhs.type() ) return false;
+
+        return v_ == lhs.v_;
+    }
+
+    template< class Config >
+    Value_type Value_impl< Config >::type() const
+    {
+        if( is_uint64() )
+        {
+            return int_type;
+        }
+
+        return static_cast< Value_type >( v_.which() );
+    }
+
+    template< class Config >
+    bool Value_impl< Config >::is_uint64() const
+    {
+        return v_.which() == null_type + 1;
+    }
+
+    template< class Config >
+    bool Value_impl< Config >::is_null() const
+    {
+        return type() == null_type;
+    }
+
+    template< class Config >
+    void Value_impl< Config >::check_type( const Value_type vtype ) const
+    {
+        if( type() != vtype )
+        {
+            std::ostringstream os;
+
+            os << "value type is " << type() << " not " << vtype;
+
+            throw std::runtime_error( os.str() );
+        }
+    }
+
+    template< class Config >
+    const typename Config::String_type& Value_impl< Config >::get_str() const
+    {
+        check_type( str_type );
+
+        return *boost::get< String_type >( &v_ );
+    }
+
+    template< class Config >
+    const typename Value_impl< Config >::Object& Value_impl< Config >::get_obj() const
+    {
+        check_type( obj_type );
+
+        return *boost::get< Object >( &v_ );
+    }
+
+    template< class Config >
+    const typename Value_impl< Config >::Array& Value_impl< Config >::get_array() const
+    {
+        check_type( array_type );
+
+        return *boost::get< Array >( &v_ );
+    }
+
+    template< class Config >
+    bool Value_impl< Config >::get_bool() const
+    {
+        check_type( bool_type );
+
+        return boost::get< bool >( v_ );
+    }
+
+    template< class Config >
+    int Value_impl< Config >::get_int() const
+    {
+        check_type( int_type );
+
+        return static_cast< int >( get_int64() );
+    }
+
+    template< class Config >
+    boost::int64_t Value_impl< Config >::get_int64() const
+    {
+        check_type( int_type );
+
+        if( is_uint64() )
+        {
+            return static_cast< boost::int64_t >( get_uint64() );
+        }
+
+        return boost::get< boost::int64_t >( v_ );
+    }
+
+    template< class Config >
+    boost::uint64_t Value_impl< Config >::get_uint64() const
+    {
+        check_type( int_type );
+
+        if( !is_uint64() )
+        {
+            return static_cast< boost::uint64_t >( get_int64() );
+        }
+
+        return boost::get< boost::uint64_t >( v_ );
+    }
+
+    template< class Config >
+    double Value_impl< Config >::get_real() const
+    {
+        if( type() == int_type )
+        {
+            return is_uint64() ? static_cast< double >( get_uint64() )
+                               : static_cast< double >( get_int64() );
+        }
+
+        check_type( real_type );
+
+        return boost::get< double >( v_ );
+    }
+
+    template< class Config >
+    typename Value_impl< Config >::Object& Value_impl< Config >::get_obj()
+    {
+        check_type( obj_type );
+
+        return *boost::get< Object >( &v_ );
+    }
+
+    template< class Config >
+    typename Value_impl< Config >::Array& Value_impl< Config >::get_array()
+    {
+        check_type( array_type );
+
+        return *boost::get< Array >( &v_ );
+    }
+
+    template< class Config >
+    Pair_impl< Config >::Pair_impl( const String_type& name, const Value_type& value )
+    :   name_( name )
+    ,   value_( value )
+    {
+    }
+
+    template< class Config >
+    bool Pair_impl< Config >::operator==( const Pair_impl< Config >& lhs ) const
+    {
+        if( this == &lhs ) return true;
+
+        return ( name_ == lhs.name_ ) && ( value_ == lhs.value_ );
+    }
+
+    // converts a C string, ie. 8 bit char array, to a string object
+    //
+    template < class String_type >
+    String_type to_str( const char* c_str )
+    {
+        String_type result;
+
+        for( const char* p = c_str; *p != 0; ++p )
+        {
+            result += *p;
+        }
+
+        return result;
+    }
+
+    //
+
+    namespace internal_
+    {
+        template< typename T >
+        struct Type_to_type
+        {
+        };
+
+        template< class Value >
+        int get_value( const Value& value, Type_to_type< int > )
+        {
+            return value.get_int();
+        }
+
+        template< class Value >
+        boost::int64_t get_value( const Value& value, Type_to_type< boost::int64_t > )
+        {
+            return value.get_int64();
+        }
+
+        template< class Value >
+        boost::uint64_t get_value( const Value& value, Type_to_type< boost::uint64_t > )
+        {
+            return value.get_uint64();
+        }
+
+        template< class Value >
+        double get_value( const Value& value, Type_to_type< double > )
+        {
+            return value.get_real();
+        }
+
+        template< class Value >
+        typename Value::String_type get_value( const Value& value, Type_to_type< typename Value::String_type > )
+        {
+            return value.get_str();
+        }
+
+        template< class Value >
+        typename Value::Array get_value( const Value& value, Type_to_type< typename Value::Array > )
+        {
+            return value.get_array();
+        }
+
+        template< class Value >
+        typename Value::Object get_value( const Value& value, Type_to_type< typename Value::Object > )
+        {
+            return value.get_obj();
+        }
+
+        template< class Value >
+        bool get_value( const Value& value, Type_to_type< bool > )
+        {
+            return value.get_bool();
+        }
+    }
+
+    template< class Config >
+    template< typename T >
+    T Value_impl< Config >::get_value() const
+    {
+        return internal_::get_value( *this, internal_::Type_to_type< T >() );
+    }
+}
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_writer.h b/contrib/json_spirit/json_spirit_writer.h
new file mode 100644
index 0000000..b79b068
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_writer.h
@@ -0,0 +1,63 @@
+#ifndef JSON_SPIRIT_WRITER
+#define JSON_SPIRIT_WRITER
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include "json_spirit_value.h"
+#include "json_spirit_writer_options.h"
+#include <iostream>
+
+namespace json_spirit
+{
+    // these functions to convert JSON Values to text
+
+#ifdef JSON_SPIRIT_VALUE_ENABLED
+    void         write( const Value&  value, std::ostream&  os, unsigned int options = 0 );
+    std::string  write( const Value&  value, unsigned int options = 0 );
+#endif
+
+#ifdef JSON_SPIRIT_MVALUE_ENABLED
+    void         write( const mValue& value, std::ostream&  os, unsigned int options = 0 );
+    std::string  write( const mValue& value, unsigned int options = 0 );
+#endif
+
+#if defined( JSON_SPIRIT_WVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    void         write( const wValue&  value, std::wostream& os, unsigned int options = 0 );
+    std::wstring write( const wValue&  value, unsigned int options = 0 );
+#endif
+
+#if defined( JSON_SPIRIT_WMVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    void         write( const wmValue& value, std::wostream& os, unsigned int options = 0 );
+    std::wstring write( const wmValue& value, unsigned int options = 0 );
+#endif
+
+    // these "formatted" versions of the "write" functions are the equivalent of the above functions
+    // with option "pretty_print"
+    
+#ifdef JSON_SPIRIT_VALUE_ENABLED
+    void         write_formatted( const Value& value, std::ostream&  os );
+    std::string  write_formatted( const Value& value );
+#endif
+#ifdef JSON_SPIRIT_MVALUE_ENABLED
+    void         write_formatted( const mValue& value, std::ostream&  os );
+    std::string  write_formatted( const mValue& value );
+#endif
+
+#if defined( JSON_SPIRIT_WVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    void         write_formatted( const wValue& value, std::wostream& os );
+    std::wstring write_formatted( const wValue& value );
+#endif
+#if defined( JSON_SPIRIT_WMVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    void         write_formatted( const wmValue& value, std::wostream& os );
+    std::wstring write_formatted( const wmValue& value );
+#endif
+}
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_writer_options.h b/contrib/json_spirit/json_spirit_writer_options.h
new file mode 100644
index 0000000..1b79421
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_writer_options.h
@@ -0,0 +1,30 @@
+#ifndef JSON_SPIRIT_WRITER_OPTIONS
+#define JSON_SPIRIT_WRITER_OPTIONS
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+namespace json_spirit
+{
+    enum Output_options{ pretty_print = 0x01,   // Add whitespace to format the output nicely.
+
+                         raw_utf8 = 0x02,       // This prevents non-printable characters from being escapted using "\uNNNN" notation.
+                                                // Note, this is an extension to the JSON standard. It disables the escaping of
+                                                // non-printable characters allowing UTF-8 sequences held in 8 bit char strings
+                                                // to pass through unaltered.
+
+                         remove_trailing_zeros = 0x04,
+                                                // outputs e.g. "1.200000000000000" as "1.2"
+                         single_line_arrays = 0x08,
+                                                // pretty printing except that arrays printed on single lines unless they contain
+                                                // composite elements, i.e. objects or arrays
+                       };
+}
+
+#endif
diff --git a/contrib/json_spirit/json_spirit_writer_template.h b/contrib/json_spirit/json_spirit_writer_template.h
new file mode 100644
index 0000000..61a0e18
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_writer_template.h
@@ -0,0 +1,385 @@
+#ifndef JSON_SPIRIT_WRITER_TEMPLATE
+#define JSON_SPIRIT_WRITER_TEMPLATE
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include "json_spirit_value.h"
+#include "json_spirit_writer_options.h"
+
+#include <cassert>
+#include <sstream>
+#include <iomanip>
+#include <boost/io/ios_state.hpp>
+
+namespace json_spirit
+{
+    inline char to_hex_char( unsigned int c )
+    {
+        assert( c <= 0xF );
+
+        const char ch = static_cast< char >( c );
+
+        if( ch < 10 ) return '0' + ch;
+
+        return 'A' - 10 + ch;
+    }
+
+    template< class String_type >
+    String_type non_printable_to_string( unsigned int c )
+    {
+        typedef typename String_type::value_type Char_type;
+
+        String_type result( 6, '\\' );
+
+        result[1] = 'u';
+
+        result[ 5 ] = to_hex_char( c & 0x000F ); c >>= 4;
+        result[ 4 ] = to_hex_char( c & 0x000F ); c >>= 4;
+        result[ 3 ] = to_hex_char( c & 0x000F ); c >>= 4;
+        result[ 2 ] = to_hex_char( c & 0x000F );
+
+        return result;
+    }
+
+    template< typename Char_type, class String_type >
+    bool add_esc_char( Char_type c, String_type& s )
+    {
+        switch( c )
+        {
+            case '"':  s += to_str< String_type >( "\\\"" ); return true;
+            case '\\': s += to_str< String_type >( "\\\\" ); return true;
+            case '\b': s += to_str< String_type >( "\\b"  ); return true;
+            case '\f': s += to_str< String_type >( "\\f"  ); return true;
+            case '\n': s += to_str< String_type >( "\\n"  ); return true;
+            case '\r': s += to_str< String_type >( "\\r"  ); return true;
+            case '\t': s += to_str< String_type >( "\\t"  ); return true;
+        }
+
+        return false;
+    }
+
+    template< class String_type >
+    String_type add_esc_chars( const String_type& s, bool raw_utf8 )
+    {
+        typedef typename String_type::const_iterator Iter_type;
+        typedef typename String_type::value_type     Char_type;
+
+        String_type result;
+
+        const Iter_type end( s.end() );
+
+        for( Iter_type i = s.begin(); i != end; ++i )
+        {
+            const Char_type c( *i );
+
+            if( add_esc_char( c, result ) ) continue;
+
+            if( raw_utf8 )
+            {
+                result += c;
+            }
+            else
+            {
+                const wint_t unsigned_c( ( c >= 0 ) ? c : 256 + c );
+
+                if( iswprint( unsigned_c ) )
+                {
+                    result += c;
+                }
+                else
+                {
+                    result += non_printable_to_string< String_type >( unsigned_c );
+                }
+            }
+        }
+
+        return result;
+    }
+
+    template< class Ostream >
+    void append_double( Ostream& os, const double d, const int precision )
+    {
+        os << std::showpoint << std::setprecision( precision ) << d;
+    }
+
+    template< class String_type >
+    void erase_and_extract_exponent( String_type& str, String_type& exp )
+    {
+        const typename String_type::size_type exp_start= str.find( 'e' );
+
+        if( exp_start != String_type::npos )
+        {
+            exp = str.substr( exp_start );
+            str.erase( exp_start );
+        }
+    }
+
+    template< class String_type >
+    typename String_type::size_type find_first_non_zero( const String_type& str )
+    {
+        typename String_type::size_type result = str.size() - 1;
+
+        for( ; result != 0; --result )
+        {
+            if( str[ result ] != '0' )
+            {
+                break;
+            }
+        }
+
+        return result;
+    }
+
+    template< class String_type >
+    void remove_trailing( String_type& str )
+    {
+        String_type exp;
+
+        erase_and_extract_exponent( str, exp );
+
+        const typename String_type::size_type first_non_zero = find_first_non_zero( str );
+
+        if( first_non_zero != 0 )
+        {
+            const int offset = str[first_non_zero] == '.' ? 2 : 1;  // note zero digits following a decimal point is non standard
+            str.erase( first_non_zero + offset );
+        }
+
+        str += exp;
+    }
+
+    // this class generates the JSON text,
+    // it keeps track of the indentation level etc.
+    //
+    template< class Value_type, class Ostream_type >
+    class Generator
+    {
+        typedef typename Value_type::Config_type Config_type;
+        typedef typename Config_type::String_type String_type;
+        typedef typename Config_type::Object_type Object_type;
+        typedef typename Config_type::Array_type Array_type;
+        typedef typename String_type::value_type Char_type;
+        typedef typename Object_type::value_type Obj_member_type;
+
+    public:
+
+        Generator( const Value_type& value, Ostream_type& os, unsigned int options )
+        :   os_( os )
+        ,   indentation_level_( 0 )
+        ,   pretty_( ( options & pretty_print ) != 0 || ( options & single_line_arrays ) != 0 )
+        ,   raw_utf8_( ( options & raw_utf8 ) != 0 )
+        ,   remove_trailing_zeros_( ( options & remove_trailing_zeros ) != 0 )
+        ,   single_line_arrays_( ( options & single_line_arrays ) != 0 )
+        ,   ios_saver_( os )
+        {
+            output( value );
+        }
+
+    private:
+
+        void output( const Value_type& value )
+        {
+            switch( value.type() )
+            {
+                case obj_type:   output( value.get_obj() );   break;
+                case array_type: output( value.get_array() ); break;
+                case str_type:   output( value.get_str() );   break;
+                case bool_type:  output( value.get_bool() );  break;
+                case real_type:  output( value.get_real() );  break;
+                case int_type:   output_int( value );         break;
+                case null_type:  os_ << "null";               break;
+                default: assert( false );
+            }
+        }
+
+        void output( const Object_type& obj )
+        {
+            output_array_or_obj( obj, '{', '}' );
+        }
+
+        void output( const Obj_member_type& member )
+        {
+            output( Config_type::get_name( member ) ); space(); 
+            os_ << ':'; space(); 
+            output( Config_type::get_value( member ) );
+        }
+
+        void output_int( const Value_type& value )
+        {
+            if( value.is_uint64() )
+            {
+                os_ << value.get_uint64();
+            }
+            else
+            {
+               os_ << value.get_int64();
+            }
+        }
+
+        void output( const String_type& s )
+        {
+            os_ << '"' << add_esc_chars( s, raw_utf8_ ) << '"';
+        }
+
+        void output( bool b )
+        {
+            os_ << to_str< String_type >( b ? "true" : "false" );
+        }
+
+        void output( double d )
+        {
+            if( remove_trailing_zeros_ )
+            {
+                std::basic_ostringstream< Char_type > os;
+
+                append_double( os, d, 16 );  // note precision is 16 so that we get some trailing space that we can remove,
+                                             // otherwise, 0.1234 gets converted to "0.12399999..."
+
+                String_type str = os.str();
+
+                remove_trailing( str );
+
+                os_ << str;
+            }
+            else
+            {
+                append_double( os_, d, 17 );
+            }
+        }
+
+        static bool contains_composite_elements( const Array_type& arr )
+        {
+            for( typename Array_type::const_iterator i = arr.begin(); i != arr.end(); ++i )
+            {
+                const Value_type& val = *i;
+
+                if( val.type() == obj_type ||
+                    val.type() == array_type )
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        template< class Iter >
+        void output_composite_item( Iter i, Iter last )
+        {
+            output( *i );
+
+            if( ++i != last )
+            {
+                os_ << ',';
+            }
+        }
+
+        void output( const Array_type& arr )
+        {
+            if( single_line_arrays_ && !contains_composite_elements( arr )  )
+            {
+                os_ << '['; space();
+               
+                for( typename Array_type::const_iterator i = arr.begin(); i != arr.end(); ++i )
+                {
+                    output_composite_item( i, arr.end() );
+
+                    space();
+                }
+
+                os_ << ']';
+            }
+            else
+            {
+                output_array_or_obj( arr, '[', ']' );
+            }
+        }
+
+        template< class T >
+        void output_array_or_obj( const T& t, Char_type start_char, Char_type end_char )
+        {
+            os_ << start_char; new_line();
+
+            ++indentation_level_;
+            
+            for( typename T::const_iterator i = t.begin(); i != t.end(); ++i )
+            {
+                indent();
+
+                output_composite_item( i, t.end() );
+
+                new_line();
+            }
+
+            --indentation_level_;
+
+            indent(); os_ << end_char;
+        }
+        
+        void indent()
+        {
+            if( !pretty_ ) return;
+
+            for( int i = 0; i < indentation_level_; ++i )
+            { 
+                os_ << "    ";
+            }
+        }
+
+        void space()
+        {
+            if( pretty_ ) os_ << ' ';
+        }
+
+        void new_line()
+        {
+            if( pretty_ ) os_ << '\n';
+        }
+
+        Generator& operator=( const Generator& ); // to prevent "assignment operator could not be generated" warning
+
+        Ostream_type& os_;
+        int indentation_level_;
+        bool pretty_;
+        bool raw_utf8_;
+        bool remove_trailing_zeros_;
+        bool single_line_arrays_;
+        boost::io::basic_ios_all_saver< Char_type > ios_saver_;  // so that ostream state is reset after control is returned to the caller
+    };
+
+    // writes JSON Value to a stream, e.g.
+    //
+    // write_stream( value, os, pretty_print );
+    //
+    template< class Value_type, class Ostream_type >
+    void write_stream( const Value_type& value, Ostream_type& os, unsigned int options = 0 )
+    {
+        os << std::dec;
+        Generator< Value_type, Ostream_type >( value, os, options );
+    }
+
+    // writes JSON Value to a stream, e.g.
+    //
+    // const string json_str = write( value, pretty_print );
+    //
+    template< class Value_type >
+    typename Value_type::String_type write_string( const Value_type& value, unsigned int options = 0 )
+    {
+        typedef typename Value_type::String_type::value_type Char_type;
+
+        std::basic_ostringstream< Char_type > os;
+
+        write_stream( value, os, options );
+
+        return os.str();
+    }
+}
+
+#endif