Added pause/resume feature

Now you can pause/resume recording to the file
Added pause/resume feature

Now you can pause/resume recording to the file
movie recording can be paused
updating
Merge commit '8986763eaf1061d150356c3ccfaf85bba679ad89'
@snchronized replaced with GCD queue
Fixed additional frames on pausing recording
Merge commit '2f8e61c4ffcdfa93ee3d8f39f8110e61cfc3daf1'

Conflicts:
	framework/Source/iOS/GPUImageMovieWriter.m
updating
Implemented pause/resume
need to dive deeper into the code
Added error property
fix Strong
fix weak
added stop recording on error
fixing
added spec
Merge commit 'b753e58c8d491d47409f9031e773b3dd85d828cd' into dev
Works pretty fine but I have audio loss an the video end. (about 3 seconds on video with duration 20 seconds)
pause/resume improvements
added cancel on audio fail
Trying another solution for pause/resume feature