static serverError (resStatus, text) {
    this.status(resStatus || 403);
    this.setHeader('Content-Type', 'application/json');
    return this.send(
      { success: false, text: text || 'Server Error!' }
    );
  }
Sends an error from the server by:
1. setting the http content-type header to json
2. setting the response status code (403 default)
3. sending a false success with message text (default "Server Error!")
@param {Number} [resStatus=403] - The response status code (optional)
@param {String} [text="Server Error!"] - The response text (optional)
@returns {Object} res - The Express.js response object