Updated to use Burner style System.
Adds world containers.
Removes Box.js
Adds supported features option for System.init()
Clears shadow buffer after applying to world.
Adds frame counts and data recording.
Adds frame counting and data recording.
Adds frameCompleteCallback().
Simplfies System.add()
Adds Utils.constrain; clears System.recordedData after each frame.
Adds recordStartFrame and recordEndFrame.
Fixes minor issue w frame complete callback; add repeller exmaple.
Updates README.
Updates README.
Updates README.
Merge pull request #1 from foldi/ver2

Bumps major version.