Added initial support for gfx. Framework only,
added rust-gears-gfx
Added GraphicsContext and GlProvider to snowmew
added vertex loading
send render commands to gfx
changed gfx-rs over to my submodule for now
Implemented environment so that the model/view/projection matrix can be set.
Merge pull request #18 from csherratt/gfx

Add gfx support to snowmew.