added sweep-prune interval draw
added sweep-prune interval draw

pietro909/PhysicsJS,haithemaraissia/PhysicsJS,rohit765/PhysicsJS,haithemaraissia/PhysicsJS,mcanthony/PhysicsJS,Nayar/PhysicsJS,jpellerin/PhysicsJS,wellcaffeinated/PhysicsJS,pietro909/PhysicsJS,Luwdo/PhysicsJS,jpellerin/PhysicsJS,griever989/PhysicsJS,VANITAX/PhysicsJS,Luwdo/PhysicsJS,VANITAX/PhysicsJS,Rawneed/PhysicsJS,griever989/PhysicsJS,eric-seekas/PhysicsJS,Nayar/PhysicsJS,eric-seekas/PhysicsJS,Rawneed/PhysicsJS,mcanthony/PhysicsJS,rohit765/PhysicsJS,wellcaffeinated/PhysicsJS