Fixed general output shutdown behaviour and logging on end of stream, MP4 output now correctly ends HTTP response on stream end.

Bugfix in HTTP::Parser when calling Chunkify before initializing

src/output/output_mp4.h

@@ -99,6 +99,7 @@ namespace Mist{
     void onHTTP();
     void sendNext();
     void sendHeader();
+    virtual bool onFinish();
 
   protected:
     uint64_t fileSize;