code: public static <R> RequestToken streamImageAsset(String id, int size, int flags, DataStreamHandler<R> data, BaasHandler<R> handler) {
          return BaasAsset.doStreamAsset(id, null, size, flags, data, handler);
      }
docs: Streams the file using the provided data stream handler.
  
  @param id       the name of the asset to download
  @param size     a size spec to specify the resize of an image asset
  @param flags    {@link RequestOptions}
  @param data     the data stream handler {@link com.baasbox.android.DataStreamHandler}
  @param handler  the completion handler
  @param <R>      the type to transform the bytes to.
  @return a request token to handle the request