Conveyor Belt demo

[zorgblaubaer]

I managed to solve both problems.

I got rid of the bouncyness by reseting the objects when the grab is removed:

else:
    if grab != False:
	grab.getDst().reset()
	grab.remove()
	grab = False

I got the objects being recognized by not removing the DropBin bounding boxes but rather make them invisible (and I also remove the objects from the scene as soon as they are inside of a bin)