Parameter support #4

Added support for parameters because I really need the updateOnly version of stations. I don't know how to tell if it is actually a streaming API, but even without a read stream it will be helpful.

    Citibike.getStations({updateOnly: "true"}, function(data) {
      console.log('data');
    };

should return

    {
      {
        'id': 1,
        'status': 'active',
        'availableBikes': 10,
        'availableDocks': 20
      },
      ...
    }