Implement util.isKineticObject()
game.collision() can now check arrays of coordinate objects and shapes in multiple lists. It now returns a boolean indicating if there was a collision, and when one occurs, passes the shape's array index via a callback function.
Deprecate game.snake.isCollidingWith.heart()
Merge branches 'master' and 'multiplayer' of https://github.com/mjhasbach/ceros-snake into multiplayer

Conflicts:
	js/libs/util.js