Bubble loading from JSON in 'game' state complete.
Added utility method for string2bool conversion
Edited Ogmo project to use strings instead of numbers for easier default
values for bubbles.
Added options to walls.js:
Added options default to wall
Added wall creation from JSON level data.
Type and error checking in Utils.stringToBool
Updated TODO
Made the pin shooter render on top of everything.
Changed goal bubble color and added temp iron overlay.
Made walls tile rather than stretch. Requires an update to CGF's render.js
Made randomized bubbles avoid spawning in walls.
Added bubble collisions with walls. Works pretty well unless a  bubble is
inside of a wall.
Implemented level data loading on Loader.load
Must update CGF for this to work
Also implemented convenience wrapper Assets.loadLevel to handle the
ugliness of loading .oel files.