Discussion permalinks

# Open: Comment permalinks

We need permalinks to comments to work in NextGen.
They now do.

### Why?
People who wanted NextGen were being forced into the past when using comment permalinks. Through changing our permalink endpoint and adding a bit of functionality to NextGen, people can be where they feel more at peace... NextGen.

The format is:
`discussion.theguardian.com/comment-permalink/COMMENT_ID`
:arrow_double_down:
`www.theguardian.com/{{ARTICLE}}#comment-COMMENT_ID`


# How?

* JS looks for `#comment-ID` in `window.location.hash`
* It then uses the new app endpoint /discussion/comment/COMMENT_ID
* This then redirects to the correct page
* The client acts as normal
* Older / Newer comment links are controlled by the app renderer.

---

P.S. Sorry for slipping in the ImageContent stuff here too. Should have waited for another pull, but unfortunately I forgot to change branch.

![show-newer-comments](https://f.cloud.github.com/assets/31692/1655281/a4cfd7f0-5b5f-11e3-9071-8f69537a1aad.png)
![show-older-comments](https://f.cloud.github.com/assets/31692/1655282/a4e7a1aa-5b5f-11e3-9e9c-3ff3db9dac36.png)

![Oh yes](http://cdn2.sbnation.com/imported_assets/1427463/Al-bundy-ed-oneill-animated-gif-2.gif)