message: fix issue with including express res object in bot
diff: @@ -225,9 +225,14 @@ function Slackbot(configuration) {
  }
  }
  + // include the response channel so that they can be used in
  + // responding to slash commands and outgoing webhooks
  + bot.res = res;
  +
  + // pass the payload into Botkit's message handling pipeline!
  slack_botkit.ingest(bot, payload, res);
  - bot.res = res;
  +
  //
  // if (payload.type === 'event_callback') {
  