rearranged and modified files
	modified:   D2.urdf
	modified:   D2.urdf~
	renamed:    brsu-c025-arena_original.urdf -> brsu-c025-arena.urdf
	modified:   brsu-c025-arena.urdf.xacro
	new file:   maze.urdf
	new file:   models/room.dae
	new file:   models/room.obj
	new file:   models/room.stl
	new file:   room.dae
	new file:   room.urdf
	renamed:    arena.launch -> trashed/arena.launch
	renamed:    arena.urdf -> trashed/arena.urdf