Changed node states when enemy is beaten in-game. Have not tested with game saves.
Merge remote-tracking branch 'origin/master'

Conflicts:
	Classes/GameLogic/Atlas/WorldLoader.m
	Classes/Layers/MainMenuLayer.m
	Classes/Layers/WorldLayer.m
	Classes/Utilities/Typedefs.h
Bring back circle.png deleted by Mark. He owes me a soda for this.
Close #61 - Node states are implemented so enemies can be defeated now.