Merge pull request #55 from Clean3d/master

Added tile animation.
Tile animations and such!

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2014-09-24 : v0.9.0
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* Added: Animated tiles! (Thanks to Clean3d)
* Fixed: A crash when a collidable rectangle has no rotation value
* Fixed: Incorrect values given to orthogonal collision objects
Fixed nil access crash where self.tileInstances[gid] == nil.