Added audio processing callback for GPUImageMovieWriter
Add category on GPUImage to allow replacing a sub texture of GPUPicture
Fix up logic for redraw
Fix assert logic
Fixed incorrectly rotated images in Mosaic Filter.
Enhanced the Swift FilterShowcase using generics. Updated to new Swift syntax.
Removed the unused unit tests from the framework.
Fixed small inconsistency in example code
Merge pull request #1671 from tomatrow/patch-1

Fixed small inconsistency in example code
Merge pull request #1652 from lauraskelton/showcase-mosaic-rotation

Fixed incorrectly rotated images in Mosaic Filter.
Merge pull request #1595 from jackwu95/master

Add category on GPUImagePicture to allow replacing the texture with a subimage
Merge pull request #1576 from nobre84/audio-processing

Added audio processing callback for GPUImageMovieWriter