Fixed #if line for iOS7. Previous version occurs memory leaking on iOS7, because there wasn't called dispatch_release(imageUpdateSemaphore) and libdispatch.dylib's malloc wasn't released.
Fix Xcode 4 compatibility
GPUImagePicture: don't redraw using CoreGraphics unless you have to

There was support for this but it appeared to have been disabled.
Completely reworked the Gaussian blur filter to use optimized, on-the-fly calculated shaders. This uses the techniques of the Fast Blur filter, so it is no longer necessary and has been removed.
Expanded Gaussian shader generator to support kernels beyond the limit of OpenGL ES varyings, using dependent texture reads after that.
Reworked the box blur in the same fashion as the new Gaussian blur, so it is now truly smooth across various radii.
Restructured the interfaces of classes relying on the blurs to use the new parameters. This will break anything using these classes, so you might want to read up on what the new parameters do.
Made the Mac side compatible with the new blur changes, fixed some 64-bit compatibility issues with them.
First implementation of a blur that simulates iOS 7's control panel background blur.
Adjusted the color for the iOS 7 blur filter to match the color correction seen in the control panel. Added a better example of this to the FilterShowcase. Cleaned up after a few of my tests.
GPUImagePicture: only access image bytes directly if the bitmap byte order and format is compatible with GL

This correct non-redrawing for JPGs from my previous commit, as they are big endian.
Add Podspec file

This will allow people using GPUImage from Cocoapods to:
* Force the latest version of the library at any time with `pod 'GPUImage', :head`.
* Specify a given commit and/or fork to use with `pod 'GPUImage', :git => 'https://github.com/...', :commit => '...`.
Enhanced my benchmark and updated my documentation to reflect more up to date Core Image numbers. I've been too hard on them.
Removed unused functions that were throwing errors in the latest LLVM.
Fix 64bit string formatting issues on iOS
Merge pull request #1287 from aburgel/ios_64bit_fixes

Fix 64bit string formatting issues on iOS
Merge pull request #1270 from rivera-ernesto/add_podspec

Add Podspec file to repository
Merge pull request #1267 from karlvr/gpuimagepicture-redraw

GPUImagePicture: don't redraw using CoreGraphics unless you have to
Merge pull request #1263 from rivera-ernesto/fix_xcode4_compatibility

Fix Xcode 4 compatibility
Merge pull request #1231 from mtfrctl/external

Fixed #if line for iOS7. Previous version occurs memory leaking on iOS7,...