Profile Discussion Acitivity

What is a user up to? We now know on an article per article basis.
This is a first pass at getting profile activity in.
It is also a move towards refactored, consistent styling on comments (now being called comment streams as they can hold any number of discussions and comments).

The `SasS` is being refactored by using a `disc-` prefix, we are including this only in the `identity` project for now, and once we have abstracted the HTML out we will move it to the article discussions.

There is also a niceandneat model of collections of comments.

__// CC__ @Nick-Smith 

![public profile identity the guardian](https://cloud.githubusercontent.com/assets/31692/3026777/22df7c56-e01a-11e3-9a08-5258b9203c59.png)

![pp-m](https://cloud.githubusercontent.com/assets/31692/3026776/22df0f28-e01a-11e3-8f5e-180cf1e1f8cc.png)

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![Trolls ahoy](http://global3.memecdn.com/Animated-Gif-on-How-to-Troll_o_141341.jpg)