per-app dashboards (bug 928160), nav to related threads/expose version numbers (bug 928165)

Related to https://github.com/mozilla/zamboni/pull/1276

/comm/app/APP_SLUG/

- Start indicating version next to app name, and whether version is obsolete
- Clicking on the app name leads to per-app dashboard threadl ist, clicking on "XX Notes" leads to thread detail.
- Order threads in the per-app dashboard by '-created', not '-modified'.
- Calls out to fireplace API just to get the app name from the app slug.
- Various prettifying (remove borders, remove extra padding on bottom of note container)

**Per-app (list view by app)**

![screen shot 2013-10-25 at 2 33 17 pm](https://f.cloud.github.com/assets/674727/1411705/48049d9a-3dbd-11e3-9790-9c5390a5b710.png)

**Related threads on single thread view**

![screen shot 2013-10-25 at 2 33 25 pm](https://f.cloud.github.com/assets/674727/1411707/4dc7e0f2-3dbd-11e3-9d40-5c4e4e167b48.png)

**No threads**

![screen shot 2013-10-25 at 2 38 27 pm](https://f.cloud.github.com/assets/674727/1411741/e594dee4-3dbd-11e3-8016-34c3d06c8531.png)

**App not found**

![screen shot 2013-10-25 at 2 33 40 pm](https://f.cloud.github.com/assets/674727/1411711/59857e90-3dbd-11e3-85d0-8e5701ca6a0c.png)

**Home**

![screen shot 2013-10-25 at 2 33 13 pm](https://f.cloud.github.com/assets/674727/1411698/3703d7b8-3dbd-11e3-935c-743d69386ca5.png)