Merge pull request #17 from beatgammit/master

Update to latest Rust
Load hex model from wavefront obj file.
Basic shadowing.
Merge pull request #18 from dpc/light

Let there be light!
Animate death.

Plus some refactoring.
`cargo update`
Merge pull request #19 from dpc/devel

Animate death.
Update screenshot.
Update README.
`cargo update`
Update to latest rustc and dependencies.
Fix: Mouse events speeding up the game.