-Added desktop controls to make for easy to drive cars using keyboard or gamepads! (can now use Jump key for HandBrake , and Walk key or Crouch key for Turbo Boost.)
-removed Truck prefab
-added a few Rear Wheel Drive and Front Wheel Drive Car prefabs
-added a "Hit Me! Dummy" you can drive into for fun :P
-fixed up the environment a tiny bit, closing holes at the ends of the half pipe and edges, preventing you from going out of bounds.