code: function(groupName, callback) {
          request.get(
              this.getResourceUrl({ path: '/groups/' + groupName, user: null }),
              function onResourceGroupResponse(err, res, body) {
                  callback(err, body && body.resources, res);
              }
          );
          return this;
      }
docs: Fetch a specific resource group
  
  @param {String} groupName
  @param {Function} callback
  @return {ImboClient}