render: try other settings for shadows (on alpha0)
box2d: to avoid stopping the drone on angle, downgrade box2d to 0.0.7
and : https://code.google.com/p/dartbox2d/issues/detail?id=29
change display (image) of gate_in and gate_out
failed to setup a "+1" popup when drone hit cube (commented), but keep the refactor done
clean: remove some "print"