code: public EndlessScrollHelper<Model> withNewItemsDeliveredTo(@NonNull ModelAdapter<Model, ?> modelItemAdapter) {
          mOnNewItemsListener = new DeliverToModelAdapter<>(modelItemAdapter);
          return this;
      }
docs: Registers an {@link OnNewItemsListener OnNewItemsListener} that delivers results to the
  specified {@link ModelAdapter} through its {@link ModelAdapter#add} method.
  
  @param modelItemAdapter
  @return
  @see #withNewItemsDeliveredTo(ModelAdapter, OnNewItemsListener) withNewItemsDeliveredTo(ModelAdapter, OnNewItemsListener)