Expose shell through game.shell, instead of using shell as game instance (keep it small)
Add working kb-bindings-ui plugin, configurable keybindings

Added game-shell support in ^0.3.0
Update to gl-now ^1.3.0, and misc patch fixes
Add voxel-keys plugin
Fix z-order, add voxel-artpacks for testing
Update to voxel-artpacks ^0.1.0, more game-shell support
Merge branch 'master' into gh-pages
Update demo: browserify demo.js > bundle.js