Facial Features Additions

Still not quite as fast as it needs to be, but it is now possible to
turn on CIDetector for any filter, or view it by itself.
Remove CIDetector from GPUImage, add to Filter Showcase.
Merge branch 'master' of github.com:BradLarson/GPUImage
better name for delegate call.
GPUImageLookupFilter
Added a few effect filters based on GPUImageLookupFilter
Added NSAssert that fails if the appropriate images haven't been added
Merge pull request #270 from MattFoley/master

Addition of CIDetector Capabilities
Merge pull request #314 from liovch/lookupfilter

GPUImageLookupFilter with a few sample effects.
Made the FilterShowcase once again iOS 4.0 compatible. Incorporated the lookup filters into the showcase and fixed the GPUImageSoftEleganceFilter.
Adobe Curve File support added.

Use [[GPUImageACVFile alloc] initWithCurveFile:@"curve.acv"] or [filter
setPointsWithACV:@"curve.acv"]
Incorporated code by Marcelo Barbudas that adds an add and divide blend, makes the darken blend aware of alpha, and fixes one issue with the tone curve filter.
Added trailing new line to files that were missing it. Removed erroneous ; character in some method's implementations. Added public methods in GPUImageVideoCamera to allow checking for existence of front-facing camera, setting a fixed frame rate on IOS5 and above, and changing AVCaptureSession on the fly. Added public methods in GPUImageMovieWriter to allow for setting video recording orientation and custom audio settings. Added check in GPUImageMovieWriter to test for missing required parameters when providing a custom video settings dictionary.
Merge branch 'master' of https://github.com/BradLarson/GPUImage
Merged in changes to upstream repo. Added comments to clarify frame rate method.
Fixed the playing of video directly in a GPUImageView, which was due to a bad -enabled property. This is now handled correctly in all input classes.
Moved orientationTransform setting to startRecordingInOrientation instead of passing it into the initWith... method of GPUImageMovieWriter.
Merged in changes from upstream. Added semicolons to the end of method implementations.
The pixellation filter now uses square pixels. The GPUImageGaussianSelectiveBlur now works over a circular region, although this can be overridden.
Merge pull request #350 from TomCorwine/master

Changes to GPUImageVideoCamera GPUImageMovieWriter and minor cleanup.