Add AnimatedTiledMapTile implementation.

See http://www.badlogicgames.com/forum/viewtopic.php?f=17&t=9152 for more
details.
Changes to TiledMapRenderer implementations.

Expose constructors taking a SpriteBatch for BatchTiledMapRenderer
subclasses.
Rendering can now be tinted by setting the color on the SpriteBatch.
Layer alpha takes into account the alpha of the SpriteBatch.
Remove OrthogonalTiledMapRenderer2.

May add it back again after it is worked on, but it isn't currently in a
usable state.