code: public static RequestToken fetchAll(BaasQuery.Criteria filter, int flags, BaasHandler<List<BaasUser>> handler) {
          BaasBox box = BaasBox.getDefaultChecked();
          FetchUsers users = new FetchUsers(box, "users", null, filter, flags, handler);
          return box.submitAsync(users);
      }
docs: Asynchronously fetches the list of users from the server.
  
  @param flags {@link RequestOptions}
  @param handler  an handler to be invoked upon completion of the request
  @return a {@link com.baasbox.android.RequestToken} to manage the request