Merge pull request #762 from karlvr/colorblends

Add color, hue, saturation and luminosity blend modes.
Fix defects as described in issue #654 - filters using a lookup filter would not update with new input.
Now passes luminance plane directly into filters that need grayscale, significantly improving performance for edge detection and related filters. Fixed a bug with the iOS 6.0 feature detection macro.
Merge pull request #766 from iamcam/master

Fixes bug where filters with Lookup Filter wouldn't update when provided new input
3x3 convolutions were being applied against an image's alpha channel, as well, which wasn't correct.
Some refactorings.
Changed "distanceNormalizationFactor" from const value to property. It was important change to make bilateral-filter's effect adjustable.
Changes to fix incorrect release of filter's target.
Merge branch 'master' of git://github.com/BradLarson/GPUImage
Fixed the blur filters, which were only blurring in one direction. Oops.
Merge pull request #778 from shu223/master

Changed "distanceNormalizationFactor" from const value to property.
Included Delegate to get Movie playing completed callback
Fixed the Lanczos resampling filter.
Fixed a bug with monochrome filters and the still camera on older devices. Removed a static analyzer warning.
Merge pull request #788 from pradyumnad/master

Included Delegate to get Movie playing completed callback
Merge branch 'linearburn' of https://github.com/karlvr/GPUImage

Conflicts:
	framework/GPUImage.xcodeproj/project.pbxproj
Added examples in the FilterShowcase for the partial pixellation and partial Gaussian blur filters.
Merge master, Kuwahara optimizations

Optimized Kuwahara filter a bit
Added Kuwahara radius 3 filter which is heavily optimized and can
process 4 megapixel images without issue
Revert "Merge master, Kuwahara optimizations"

This reverts commit 9655f16e89caf35878ac7d2f3e2646568a5a670a.
Merge branch 'master' of git://github.com/BradLarson/GPUImage