Added debugDraw support for p2.js
Fixed mediaFolder on game.Emitter
Moved rotateScreen attribute to property
Updated version number
Added debugDraw property to game.Sprite and game.Container
Added debugDraw support for circle hitArea
Added game.main module to require engine.core by default
Added shift, ctrl and alt parameters to keydown event
Merge branch '1.2.1' into develop
Changed tween classes to use game.Class
Fixed nocache
Added tween pause and resume methods
Changed default debug color to white
Added flash detection
Fixed particle setTexture
Cleaned core code
Updated documentation
Optimized vector class
Updated particle module to work without physics module
Fixed particle velocity rotate