code: function saveWarning(req, res) {
      var text = req.body.action === 'save' ? req.body.warning_text : '';
  
      dreadnot.setWarning(req.remoteUser, text, function(err) {
        if (err) {
          res.respond(err);
        } else {
          getWarning(req, res);
        }
      });
    }
docs: Store the warning message