code: void configure(String tilePath, OnOfflineTilesConfiguredCallback callback) {
      new ConfigureRouterTask(navigator, tilePath, callback).execute();
    }
docs: Configures the navigator for getting offline routes
  
  @param tilePath directory path where the tiles are located
  @param callback a callback that will be fired when the offline data is initialized and
  {@link MapboxOfflineRouter#findRoute(OfflineRoute, OnOfflineRouteFoundCallback)}
  can be called safely