- Mozilla tut: https://developer.mozilla.org/en/Canvas_tutorial/Basic_usage
- Performance hints: http://www.html5rocks.com/en/tutorials/canvas/performance/
- Ref: http://www.w3.org/TR/2dcontext/
- Not sure if we need to do this cross-platform thing: http://www.html5canvastutorials.com/advanced/html5-canvas-animation-stage/