Add player class for later use
Merge branch 'master' of https://github.com/sekhat/LudumDare31
Add collisions between player and walls

Add physics between the player character and level walls. Correct z-index
on player, walls and floors to correctly show player when in front or
behind walls.
Merge branch 'master' of https://github.com/ginja85/LudumDare31

Conflicts:
	src/scripts/game.coffee