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.
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