Alpha 0.3.0

-> Added physics handle with gravity implemented
-> Physics handle can be attached to scene object and all sprites will be added automatically to the physics handle
-> Added add sprite method to scene
-> Added move, calculateVector,	applyForce, calculateComponent functionality to the physics module.
-> Physics handle now uses functions in the physics module
-> Added different gravity constants (EARTH_SURFACE_GRAVITY=9.81, MOON_SURFACE_GRAVITY=1.60, BASIC_GRAVITY=1.00) Default is BASIC_GRAVITY
-> Blood splatter is fully functional. Simply add the Blood Splatter group to the scene