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.
Added an experimental glass sphere filter.
Remove CIDetector from GPUImage, add to Filter Showcase.
May have finally fixed the black frame issue. Fixed the sphere refraction filter that I broke earlier today.
Merge branch 'master' of github.com:BradLarson/GPUImage
better name for delegate call.
Fix for imageByFilteringImage: being influenced by device orientation
extended movie writer to optionally allow the AVAssetWriter fileType & AVAssetWriterInput outputSettings dictionary to be specified on init

- movie writer can still be setup & used as before, & the default fileType & outputSettings are used in that case (as set in initializeMovie)
- an extended init method was added that can override these settings

TODO: if supplying a custom outputSettings dictionary, you currently need to manually specify the AVVideoCodecKey, AVVideoWidthKey & AVVideoHeightKey values. Could look to auto set these if their left empty (or is there any use case were you might want to leave them empty?)
exposed the count of filters in a group

useful when managing dynamic filter groups
(for things like looping through & automatically setting the chain of targets & initial & terminal filters)
Merge pull request #310 from phil-m/moviewriter-init

extended movie writer to optionally allow the AVAssetWriter fileType &...
Merge pull request #311 from phil-m/filtergroup-count

exposed the count of filters in a group
GPUImageLookupFilter
Added a few effect filters based on GPUImageLookupFilter
Merge pull request #296 from chwilliam/master

imageByFilteringImage: Is influenced by device orientation
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.