Added a method to automatically change the activeFormat to one that matches a framerate and a dimension
Removed dependecy for ImageIO
Added an example for recording the sound only
Merge branch 'master' of https://github.com/rFlex/SCAudioVideoRecorder

Conflicts:
	SCAudioVideoRecorder/SCAudioVideoRecorder.m
	SCAudioVideoRecorderExampleIOS/en.lproj/MainStoryboard.storyboard