code: function (appIdOrSlug, data) {
      var path;
      if (appIdOrSlug && data) {
        path = this.constructPath(constants.APPS, appIdOrSlug);
        return this.Core.POST(path, data);
      } else {
        return this.rejectRequest('Bad Request: An app id or slug and a data object are required.');
      }
    }
docs: Update an app
  @param  {String|Integer} appIdOrSlug A Robin app identifier or slug
  @param  {Object}         data        A data object
  @return {Function}                   A Promise