NSObject-_KVO_swizzledClass w/o deprecated runtime methods
NSObject-_KVO_swizzledClass w/o deprecated runtime methods

Changed NSObject-_KVO_swizzledClass implementation to using current API present in Apple and GNU (as
of GCC 4.6) runtime.

liruqi/cocotron,berkus/cocotron,berkus/cocotron,liruqi/cocotron,berkus/cocotron,berkus/cocotron,liruqi/cocotron,liruqi/cocotron