clean up ratings pages, move dev page headers outside of islands, iarc slugs

Code quality!

- address code review from https://github.com/mozilla/zamboni/commit/8729d21c8f936bcd367e42dcafc38866d85e28c5#commitcomment-4517955
- move all h2s outside of islands on dev pages
- add 32px margin under each island to match the margins of the edit listing page (hence all of the ```sections``` wrapping the islands)
- need to update flue and fireplace to account for the slugs

![screen shot 2013-11-05 at 5 21 45 pm](https://f.cloud.github.com/assets/674727/1479426/3433b142-4683-11e3-994f-c41e82a2f7bc.png)