refactor and reorganize reviewer tools navigation (bug 839400)

https://bugzilla.mozilla.org/show_bug.cgi?id=839400

**Notes:**

- Affects both desktop and mobile.
- Also handles https://bugzilla.mozilla.org/show_bug.cgi?id=896785 (add theme tabs to the list style queue)

Screenshots
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![screen shot 2013-07-24 at 2 22 01 pm](https://f.cloud.github.com/assets/674727/852008/cd4aa634-f4a7-11e2-96d1-64d0fa74ccbb.png)

![screen shot 2013-07-24 at 2 22 22 pm](https://f.cloud.github.com/assets/674727/852010/cf39b426-f4a7-11e2-9abd-d1ab6f648cd3.png)

![screen shot 2013-07-24 at 2 24 15 pm](https://f.cloud.github.com/assets/674727/852011/d0811cfc-f4a7-11e2-9a67-8001e8e0c282.png)