GPUImageAudioPlayer added + better video realtime play (with drop frames)
GPUImageMovie - Make sure reader status = AVAssetReaderStatusReading before reading next buffer. Set audioPlayer to nil in endProcessing
GPUImageOutput - Added another implementation to removeTarget/addTarget methods that run on current queue(not the video processing queue as before) and doesn't reset the targets
Merge commit 'f2fae19d04b33f8f4c5bbb99e02b915df2129994' into pheed-audio-merge

Conflicts:
	framework/GPUImage.xcodeproj/project.pbxproj
	framework/Source/GPUImageMovie.m
Resetting GPUImageMovie and GPUImageMovieWriter to pheed/GPUImage state at f2fae19d04b33f8f4c5bbb99e02b915df2129994.