Merge pull request #1 from crazysam/FlxSpine

Cleaned up FlxSpine class, and added performance logs
Merge pull request #2 from crazysam/FlxSpine

Removed debugging code.
flipX, flipY properties

flipX is affecting facing property also
rotation and scaling support
FlxSpine destroy() method. FlixelTextures for better memory management
origin support
a little bit less calculations for drawing
moving flixel textures in their own package