code: public BaasResult<Void> deleteSync() {
          if (id == null)
              throw new IllegalStateException("this document is not bound to any remote entity");
          BaasBox box = BaasBox.getDefaultChecked();
          Delete delete = new Delete(box, this, RequestOptions.DEFAULT, null);
          return box.submitSync(delete);
      }
docs: Syncrhonously deletes this document on the server.
  @return the result of the request