code: function oauthErrorResponder(req, res, err) {
    var accepts = req.accepts(['html', 'json']);
    var config = req.app.get('stormpathConfig');
  
    if (accepts === 'json') {
      return writeJsonError(res, err);
    }
  
    return renderLoginFormWithError(req, res, config, err);
  }
docs: Takes an error object and responds either by
  rendering the login form with the error, or
  by returning the error as JSON.
  
  @method
  
  @param {Object} req - The http request.
  @param {Object} res - The http response.
  @param {Object} err - The error to handle.