Remove trailing whitespace.
Add animation loading to splat.
Move image filenames to AnimationLoader.
Support Animation repeatAt in manifest.
Add SceneManager. Make scene set this.
Add default loading screen to Splat.
Move canvas size management into Splat.
Log errors loading sounds.
Fix jshint warnings.
Don't auto-start the first scene.
Intelligently resize the canvas.

This works with any canvas size and screen size. It scales the canvas so
it fits, and retains the correct aspect ration.
Make SoundLoader a noop when audio doesn't work.

IE doesn't support Web Audio API. This allows the game to still play
minus sound.