Node cleaning and refactoring + add zombie state
Node and livingEntity cleaning and refactoring
think and act needs detaTime
GameLoop factorization
direction normalization in Node constructor
Zombies moving when idle
Zombies movement independent from fps
zombies movement NOW independent from fps
Double constructed TestRooms fixed
Test 5 zombies per room
Update physics
Merge branch 'master' into physics

Conflicts:
	src/entity/player/Player.java
	src/game/GameLoop.java
Update physics (NPC)