Added Nape support.
Default mainBody is now a rectangle (instead of circle) based on the size of the image.

Added createCircleBody() Method.
Added setBodyMaterial() Method.

Debug graphics now follow camera and zoom.

Other Minor Fixes.

Comments/documentation improved.
Removed copies of PhysState and PhysSprite from src/addons..

Having some troubles using git, somehow those files got there when i was trying to update the pull request.
Fixed some git bad usage again.
This time had to fix package from addons to addons.nape on both classes... hopefully this time its fixed.