code: public BaasResult<BaasDocument> saveSync(SaveMode mode,BaasACL acl) {
          BaasBox box = BaasBox.getDefaultChecked();
          if (mode == null) throw new IllegalArgumentException("mode cannot be null");
          Save save = new Save(box, mode,acl, this, RequestOptions.DEFAULT, null);
          return box.submitSync(save);
      }
docs: Synchronously saves the document on the server with initial acl
  @param mode {@link com.baasbox.android.SaveMode}
  @param acl {@link com.baasbox.android.BaasACL} the initial acl settings
  @return the result of the request