code: function(group) {
                  console.log('iamInterface.user.deleteGroup');
                  corbel.validate.values(['id', 'group'], {
                      'id': this.id,
                      'group': group
                  });
                  return this.request({
                      url: this._buildUriWithDomain(this.uri, this.id) + '/group/' + group,
                      method: corbel.request.method.DELETE
                  });
              }
docs: Delete group to user
  @method
  @memberOf iam.UserBuilder
  @param {Object} groups     The data of the groups
  @return {Promise}  Q promise that resolves to undefined (void) or rejects with a {@link SilkRoadError}