Made RBT::body(int) to throw exception on out-of-bounds indexes
Made RBT::body(int) to throw exception on out-of-bounds indexes

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