Updated to allow access to TileEntities information since this was required to
render the skulls properly

Added skulls and did appropriate work for all north directions.

Not all rotations of skulls are working since this is rotating a 3D block which
hasn't been done yet

Screenshot at: http://i.imgur.com/q0aCI.jpg

Also minor update to ensure that Ender Frame Portals with inserted Ender Eye
will render properly