code: function responseHandler (res, next) {
    return function (err, message) {
      if (err || !message) {
        next(err);
      } else {
        res.send(message);
      }
    }
  }
docs: Returns a response handler using `res` and `next` from Express.
  
  @param {Object} res
  @param {Function} next
  @return {Function}
  @api private