/**
  * Perform the POST action for changing account credentials for a given group.
  * Permissions::PROJECT_ADMIN on the specified group is required to perform this action.
  */
 public function updateAccountCredentials($groupName)
 {
     $cfUser = Input::get('cfUsername');
     $cfPass = Input::get('cfPassword');
     $newValues = [ProjectHandler::CF_USER => $cfUser, ProjectHandler::CF_PASS => $cfPass];
     ProjectHandler::changeCredentials($groupName, $newValues);
     return Redirect::back()->with('flashSuccess', 'Invitation code successfully updated.');
 }