Make Redis step mandatory.

The app won't work without Redis on Heroku, so no sense it making it sound like an optional step.
Merge pull request #169 from sursh/patch-1

Make Redis step mandatory.
Added xmppDomain
Merge pull request #172 from MJSmith5/master

Added xmppDomain
Fix version update from last PR merge
Merge branch 'master' of github.com:hipchat/hubot-hipchat