added fix for wrong color/alpha display on iOS 7 simulator
removed warnings when compiling for 64 bit

This is actually just an intermediate solution. It would probably be better to change all Sparrow APIs to use 'NSInteger' and 'NSUInteger' instead of 'int' and 'uint'. But for now, this solution works.
hiding status bar sample apps on iOS 7
fixed PMA texture usage on actual iOS 7 devices
added a 'texture' property, as well as 'regionByName:' and 'frameByName:' methods to SPTextureAtlas
some more small 64 bit changes
converted Sparrow from ARC to MRC
checking OpenGL error flag before loading any texture

GLKTextureLoader always fails if 'glGetError()' is not clean -- even though the error actually happened somewhere else. So we better remove any pending error before initiating the loading process.
moved 'setCurrentController' from internal to public 'Sparrow' class interface
raised version to 2.0.1
updated change log for v2.0.1
Merge branch 'master' of git://github.com/racarone/Sparrow-S into racarone-master
using 'dispatchEventWith:' methods for ADDED/REMOVED events
re-added SparrowClass_Internal
added some MRC API documentation to 'removeEventListenerForType:block'
optimized broadcast of enter frame event
implemented limited OpenGL state caching
minor optimizations
removed obsolete comment
replaced id with instancetype for methods that return an instance of the receiving class’s type