Fixed error with get method in nodemap to not return null
Made map start painting itself
Got some better painting order
Made Resources and Terrain be observed correctly
Changed color of background. Spent more time trying to figure out painting order
Got painting of nodes to work correctly
Merge branch 'master' of https://github.com/Tadimsky/vooga into map-painting

Conflicts:
	src/vooga/rts/state/GameState.java
Merge pull request #51 from Tadimsky/map-painting

The map is now able to paint itself correctly by the depth. The map also observes units, terrain and resources.