src: Refactoring common.hpp and minimizing exposed includes

Face class has relatively large rewrite to hide internals using
Implementor pattern.  As of this commit, <boost/asio.hpp> is not
automatically included whenever ndn-cxx/face.hpp is included.  If it is
needed to directly work with io_service, asio.hpp should be specifically
included.

Change-Id: Ie742b851025b4e3da634eb981319df0f42937855
diff --git a/src/management/nfd-control-response.hpp b/src/management/nfd-control-response.hpp
index 0a97504..c239804 100644
--- a/src/management/nfd-control-response.hpp
+++ b/src/management/nfd-control-response.hpp
@@ -14,6 +14,7 @@
 #define NDN_MANAGEMENT_CONTROL_RESPONSE_HPP
 
 #include "../encoding/block.hpp"
+#include "../encoding/block-helpers.hpp"
 #include "../encoding/tlv-nfd.hpp"
 
 namespace ndn {
diff --git a/src/management/nfd-face-event-notification.hpp b/src/management/nfd-face-event-notification.hpp
index 307c0d9..6432d30 100644
--- a/src/management/nfd-face-event-notification.hpp
+++ b/src/management/nfd-face-event-notification.hpp
@@ -18,6 +18,7 @@
 
 #include "../encoding/tlv-nfd.hpp"
 #include "../encoding/encoding-buffer.hpp"
+#include "../encoding/block-helpers.hpp"
 
 namespace ndn {
 namespace nfd {
diff --git a/src/management/nfd-face-status.hpp b/src/management/nfd-face-status.hpp
index b3cf120..02e9b9a 100644
--- a/src/management/nfd-face-status.hpp
+++ b/src/management/nfd-face-status.hpp
@@ -18,6 +18,7 @@
 
 #include "../encoding/tlv-nfd.hpp"
 #include "../encoding/encoding-buffer.hpp"
+#include "../encoding/block-helpers.hpp"
 
 namespace ndn {
 namespace nfd {
diff --git a/src/management/nfd-fib-entry.hpp b/src/management/nfd-fib-entry.hpp
index 1ed98cf..eaa372c 100644
--- a/src/management/nfd-fib-entry.hpp
+++ b/src/management/nfd-fib-entry.hpp
@@ -18,6 +18,8 @@
 #include "../encoding/tlv-nfd.hpp"
 #include "../name.hpp"
 
+#include <list>
+
 namespace ndn {
 namespace nfd {
 
diff --git a/src/management/nfd-forwarder-status.hpp b/src/management/nfd-forwarder-status.hpp
index ce34d36..43e6150 100644
--- a/src/management/nfd-forwarder-status.hpp
+++ b/src/management/nfd-forwarder-status.hpp
@@ -15,6 +15,9 @@
 
 #include "../encoding/tlv-nfd.hpp"
 #include "../encoding/encoding-buffer.hpp"
+#include "../encoding/block-helpers.hpp"
+
+#include "../util/time.hpp"
 
 namespace ndn {
 namespace nfd {