Update pivotal story listener to be better

![image](https://cloud.githubusercontent.com/assets/12883/4424847/93513e36-45a3-11e4-9293-07565589b916.png)

I looked into it but unfortunately hipchat doesn't support sending html over the jabber protocol (which is what the hubot adapter communicates with)

https://github.com/hipchat/hubot-hipchat/issues/151