First stab at animation
Simple animation working

Not handling moving on/off bar or bear off yet
Animate moving off bar and bare off
Don't highlight movable checkers while moving
Minor cleanups for animation
Merge branch 'master' into animate

Conflicts:
	src/com/wackadoodle/wackgammon/GameBoard.java
	src/com/wackadoodle/wackgammon/PlayGameActivity.java