code: public BusHub addBusHub(String name, BusStop... stops) {
  		// Do not set immediatly the container to
  		// avoid event firing when adding the stops
  		final BusHub hub = new BusHub(null, name);
  		for (final BusStop stop : stops) {
  			hub.addBusStop(stop, false);
  		}
  		if (addBusHub(hub)) {
  			return hub;
  		}
  		return null;
  	}
docs: Add a bus hub in this network.
  At least, one bus stop must be given to create a hub if you pass a
  <code>null</code> name.
  
  @param name is the name of the hub.
  @param stops are the bus stops to put inside the hub.
  @return the create bus hub, or <code>null</code> if not created.