Added wavefront object loading
First attempt and normals
Fixed normals (used generic autogeneration)
Fixed normals (used generic autogeneration)
Added rbenv-version
Merge branch 'normals' of https://github.com/jellymann/graphics into normals

* 'normals' of https://github.com/jellymann/graphics:
  Fixed normals (used generic autogeneration)
Merged normals into master (now Mac OS X compatible)