Return a list of rows from the feed file that are related to this
    trip.

def handle_json_GET_triprows(self, params):
    """Return a list of rows from the feed file that are related to this
    trip."""
    schedule = self.server.schedule
    try:
      trip = schedule.GetTrip(params.get('trip', None))
    except KeyError:
      # if a non-existent trip is searched for, the return nothing
      return
    route = schedule.GetRoute(trip.route_id)
    trip_row = dict(trip.iteritems())
    route_row = dict(route.iteritems())
    return [['trips.txt', trip_row], ['routes.txt', route_row]]