Add documentation comments for polygon offset settings.
Merge pull request #35 from littleguy77/master

Add documentation comments for polygon offset settings.
fix MK64 disco colors during transition (and certainly other games). I have the impression the original author have the assumption that primColor where use during the FillRect RDP command. I would have really loved to know more about this because from any documentation I can get, primColor is never used with FillRect...
unbind texture at the end of each function to avoid problem when Texture are created but not updated instantly. Should fix #28
remove three methods related to do texture scaling and ensure power of 2 textures on the CPU side. This methods where actually never called. Also remove members related to this methods
Merge remote-tracking branch 'upstream/master'