Cleaned up the edge detection filters. Added Prewitt edge detection and a simple XY derivative filter.
Added a Harris corner detection filter. It's crude, but functional.
Added Mosaic filter and 3 tilesets

The mosaic filter replaces the input image with a tile based on the
luminance of the input image.  It requires a tile set that is
structured by luminance in ascending order.  The idea is to replicate
the ASCII video images, but any tile set can be used.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	framework/GPUImage.xcodeproj/project.pbxproj
Fixed a serious bug with the fast blur filter where it was only blurring vertically. Started adding non-maximum suppression to the Harris corner detector.
Replaced everything with a copy from the parent project

Had some corruption I couldn't track down
using theirs
JFA Voroni Filter

The Voroni filter needs an input set of points in image form, the point
color needs to work with the function (r=x, g=y, b=quadrant).  It will
generate a diagram of colors that represent the center point for their
quadrant.  The consumer filter takes that and uses it with an image to
do something very similar to the crystallize filter of Core Image (OS X
only)
adding attributions
To fix photos getting corrupted with the iOS 5.0 texture caches, I now pause camera input while capturing a photo.
Trying another means of preventing photos from being overwritten in memory. The first one led to crashes.
Implemented a locking at the pixel buffer level for an even more robust prevention of updates while taking a photo.
Made the histogram respect the background color setting.
Added -forceProcessingAtSizeRespectingAspectRatio per Alaric Cole's suggestion to make thumbnail generation easier while preserving image aspect ratios.
Trying to fix some memory buildup conditions.
Crop filter now maintains the aspect ratio of the cropped image.
Merge remote-tracking branch 'upstream/master'
Began documenting GPUImageOutput
Change user-defined build setting APPLEDOC_PATH to the path appledoc is installed (/usr/local/bin/appledoc is default for homebrew)
Change user-defined build setting BUILD_DOCUMENTATION to 0 or 1
Mentioned documentation (and how to make it) in the README.