Merge pull request #1 from crazysam/master

Improvements
FlxSpine sprite
implemented y-flipping
bounds calculation start (size is correct, but position isn't)
implemented batching on native targets
Merge branch 'FlxSpine' of https://github.com/Beeblerox/FlxSpineSprite

Conflicts:
	source/FlxSpineSprite.hx
Cleaning up spaces vs tabs that drive me nuts.