Perfs, playground, renderer, scene

- Added a folder container performance bits I tried
- Added Renderer
- Added Scene (from old project so a few tweaks still need to be made)
- Created playground folder so I could actually try bits
- Created polyfill file so I can put any polyfills I might need in
there. So far only requestAnimationFrame and performance.now()

I need to change all my mocha tests to Qunit (or some other testing
framework). I couldn't get DOM to work properly and couldn't find a
suitable way to test canvas in it. If someone reads this and knows how,
please let me know :P