Moving apps back to apps/ folder.  Finally worked out the problem with headers

WAF building system copies all headers to one directory. As a result,
all #include directives in all NS3 modules should be either in form
"ns3/header-file.h" or just "header-file.h", disregarding the actual
directory structure.
diff --git a/apps/stupid-interest-generator.h b/apps/stupid-interest-generator.h
new file mode 100644
index 0000000..395bc3f
--- /dev/null
+++ b/apps/stupid-interest-generator.h
@@ -0,0 +1,78 @@
+//
+//  ndn_stupidinterestgenerator.h
+//  Abstraction
+//
+//  Created by Ilya Moiseenko on 05.08.11.
+//  Copyright 2011 UCLA. All rights reserved.
+//
+
+#include "ns3/application.h"
+#include "ns3/log.h"
+#include "ns3/address.h"
+#include "ns3/random-variable.h"
+#include "ns3/nstime.h"
+#include "ns3/event-id.h"
+#include "ns3/ptr.h"
+#include "ns3/udp-socket-factory.h"
+#include "ns3/socket.h"
+
+namespace ns3 
+{
+
+    
+//namespace NDNabstraction
+//{
+    class Socket; //dynamic linking works in a somehow strange way
+    
+    class StupidInterestGenerator: public Application
+    {
+    public: 
+        static TypeId GetTypeId (void);
+        
+        StupidInterestGenerator ();
+        
+        virtual ~StupidInterestGenerator();
+        
+                
+    protected:
+        virtual void DoDispose (void);
+    private:
+        // inherited from Application base class.
+        virtual void StartApplication (void);    // Called at time specified by Start
+        virtual void StopApplication (void);     // Called at time specified by Stop
+        
+        //Time m_onTime;
+        Time m_offTime;
+        
+        Address         m_peer;         // Peer address
+        Ptr<Socket>     m_socket;
+        EventId         m_startStopEvent;     // Event id for next start or stop event
+        EventId         m_sendEvent;    // Eventid of pending "send packet" event
+        TypeId          m_tid;
+        
+        //helpers
+        void CancelEvents ();
+        
+        void Construct (Ptr<Node> n,
+                        const Address &remote,
+                        std::string tid,
+                        const RandomVariable& ontime,
+                        const RandomVariable& offtime,
+                        uint32_t size);
+        
+        // Event handlers
+        void StartSending ();
+        void StopSending ();
+        void SendPacket ();
+        
+    private:
+        void ScheduleNextTx ();
+        void ScheduleStartEvent ();
+        void ScheduleStopEvent ();
+        void ConnectionSucceeded (Ptr<Socket>);
+        void ConnectionFailed (Ptr<Socket>);
+        void Ignore (Ptr<Socket>);
+
+    };
+//}
+}