Add Obstacle component that has collision detection
Use foreach loop in obstacles on hit
Add GameMaster

Adds two new keybindings:
-   e: spawns an enemy
-   o: spawns an obstacle
Merge remote-tracking branch 'origin/hannah'

Conflicts:
	coffee/components.coffee
	coffee/scenes.coffee
Allows you to randomly spawn some rats when you press the 'r' key

- Also eliminates console.out statements from Rat
- Moves one of the spawn routines back where it should be