iOS autoreleasepool changes - Changes for #2808
Minor typo fix.
iOS-VideoGrabber Fixes

-Fixes for iOS revisions less than 7.
-Now builds against SDK levels lower than 7
Merge remote-tracking branch 'upstream/master' into iOS-VideoGrabber-Fixes2
small bugfix for GLFW drag drop callback for retina screens. Closes #3023
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
non-deprecated startThread in ofOpenALSoundPlayer

fixes #3029
Merge pull request #3031 from admsyn/fix-deprecated-startthread

use non-deprecated startThread in ofOpenALSoundPlayer
Merge pull request #2947 from danoli3/iOS-VideoGrabber-Fixes2

iOS-VideoGrabber Fixes
removes assimp lib from libs ( duplicate ) closes #3025
Merge pull request #2888 from danoli3/iOSAutorelease

iOS autoreleasepool changes - Changes for #2808
add missing left alt key release in events example
Merge pull request #3032 from admsyn/fix-left-alt-events-example

Add missing "case" for left alt key release in events example
不知道为什么这些文件被修改了.
Merge branch 'master' into sonovo

Conflicts:
	libs/assimp/include/Compiler/poppack1.h
	libs/assimp/include/Compiler/pushpack1.h
	libs/assimp/include/DefaultLogger.h
	libs/assimp/include/IOStream.h
	libs/assimp/include/IOSystem.h
	libs/assimp/include/LogStream.h
	libs/assimp/include/Logger.h
	libs/assimp/include/NullLogger.h
	libs/assimp/include/ProgressHandler.h
	libs/assimp/include/aiAnim.h
	libs/assimp/include/aiAssert.h
	libs/assimp/include/aiCamera.h
	libs/assimp/include/aiColor4D.h
	libs/assimp/include/aiColor4D.inl
	libs/assimp/include/aiConfig.h
	libs/assimp/include/aiDefines.h
	libs/assimp/include/aiFileIO.h
	libs/assimp/include/aiLight.h
	libs/assimp/include/aiMaterial.h
	libs/assimp/include/aiMaterial.inl
	libs/assimp/include/aiMatrix3x3.h
	libs/assimp/include/aiMatrix3x3.inl
	libs/assimp/include/aiMatrix4x4.h
	libs/assimp/include/aiMatrix4x4.inl
	libs/assimp/include/aiMesh.h
	libs/assimp/include/aiPostProcess.h
	libs/assimp/include/aiQuaternion.h
	libs/assimp/include/aiScene.h
	libs/assimp/include/aiTexture.h
	libs/assimp/include/aiTypes.h
	libs/assimp/include/aiVector2D.h
	libs/assimp/include/aiVector3D.h
	libs/assimp/include/aiVector3D.inl
	libs/assimp/include/aiVersion.h
	libs/assimp/include/assimp.h
	libs/assimp/include/assimp.hpp