Filled in more API docs
Added Ray cast from qml-box2d along with the example
rename fps to ups for Updates Per Second.  This is to prevent the possible
perception that this might affect rendering.  FPS is most commonly associated
with frames rendered.
Merge pull request #35 from kenvandine/add-docs

Filled in more API docs
Merge pull request #36 from kenvandine/raycast

Added Raycast from qml-box2d along with the example
Merge pull request #37 from kenvandine/fps_ups

Rename fps to ups for Updates Per Second.