On the way to fix #38

- Add a stream() function to the pipe to get an iterator that streams (for Telemeta HttpResponse)
- inside stream(), run pipe.run() inside a thread and get back appsink signal through a Queue
Clean up code to treat log prints madness
GstEncoder : fix appsrc blocking against the new pipe streamer threading arch
VorbisEncoder : passing the low level app and file streaming test
VorbisEncoder : passing the low level app and file streaming test
Merge branch 'fix_streaming_bug' of github.com:yomguy/TimeSide into fix_streaming_bug
cleanup some prints
Clean-up code for test_lolevel_streaming_threaded
Streming bug : mainloop thread does not seem to be needed here
streaming bug : clean-up unnecessary code changes
Put MainloopThread in gstutils
Merge fix_streaming_bugbranch in dev + Core : enable to run pipe with only a decoder
Add test for encoder streaming