Remove unnesesary dynamic_cast<RigidBody::CollisionElement>
Remove unnesesary dynamic_cast<RigidBody::CollisionElement>

billhoffman/drake,billhoffman/drake,sheim/drake,sheim/drake,sheim/drake,sheim/drake,sheim/drake,sheim/drake,billhoffman/drake,billhoffman/drake,sheim/drake,billhoffman/drake,billhoffman/drake,billhoffman/drake,billhoffman/drake,sheim/drake