Comment meta

We're showing a small amount of meta information that the user might find useful about the conversation.

* Number of comments
* Number of thread
* Number of people

Hopefully this will inspire people to participate, or at least read a little more.

![discussion-meta](https://f.cloud.github.com/assets/31692/1594118/a848bd3a-52d5-11e3-9c42-a2a9fc1986ff.png)

![Get goin'](http://cdn.themetapicture.com/media/funny-gif-Beatles-Abbey-Road-animated.gif)