moar topic actions for make glorious hipchatting empire

@danielhfrank 
![keep-calm-and-thumbs-up-borat](https://cloud.githubusercontent.com/assets/1863240/4125005/b33442a8-32dd-11e4-8575-43b05f248f12.png)

I think this can be simplified to
`channel_txt = 'channel %s in ' % event.get('channel', '')`
but is probably even better as
`channel_txt = event.get('channel') and 'channel %s in ' % event['channel'] or ''`