move discussion meta text

moving the discussion meta from javascript to scala templates and moving it visually into left-hand col:

![image](https://cloud.githubusercontent.com/assets/960919/4544325/307e7c0a-4e32-11e4-8247-124f8e73c40c.png)

looks like `renderCommentBar` and `initState` have very similar caller behaviour and do general initing. Think they could probably be merged.