The ball object will now be created to be the same size as the map object created in the collision layer of the map. So larger or smaller balls are now possible.
Cleaned up the WorldPopulator.
Fixed bug with polygon map objects in the WorldPopulator.
Added support for PolylineMapObjects.
Allowed various properties for objects to be set from the map object properties so that things like restitution and friction can be set on a per object basis.