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.
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 => '...`.
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,...
Merge commit 'ec9b9f81dca8a59fc0b2ce356b8f0991be0f2282' into master-runmad

* commit 'ec9b9f81dca8a59fc0b2ce356b8f0991be0f2282':
  Fix 64bit string formatting issues on iOS
  Add Podspec file
  GPUImagePicture: only access image bytes directly if the bitmap byte order and format is compatible with GL
  GPUImagePicture: don't redraw using CoreGraphics unless you have to
  Fix Xcode 4 compatibility
  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.

Conflicts:
	framework/Source/GPUImageBoxBlurFilter.m
	framework/Source/GPUImageGaussianBlurFilter.m
	framework/Source/GPUImageSingleComponentGaussianBlurFilter.m