Update CMakeLists.txt
Add missing cassert include.
Add sorting to extension generation
Merge branch 'master' of https://github.com/scheibel/glbinding
Move cassert include to OS X specific code
Fix for problem with the CMake XCode generator ignoring the CMAKE_BUILD_TYPE value.
Merge remote-tracking branch 'origin/master' into arguments_callback

Conflicts:
	source/glbinding/source/extension_requirements.cpp