HeavyLoader fix

I HACKED IT IN.
No, in seriousness, I converted vertex format from .obj into the
currently used simple Vertex format. Also fixed my index method in
RenderMan because it was using the wrong value to offset indices. Blah.
Cube now loads, the colors are inversed but I think that's because of we
define a face via obj file? I wanted to submit what we had first
especially since a lot of this will have to be redone anyway.