Bug 1084116 - Remove nav on logo and jobs button to preserve user state

This fixes Bugzillla bug [1084116](https://bugzilla.mozilla.org/show_bug.cgi?id=1084116).

In it, we remove the link off the main Treeherder logo, and remove the remaining menu (jobs), since the behavior of both are destructive - unless the user happens to be on mozilla-central with no filters applied.

Like *timelines* and *machines* removed in https://github.com/mozilla/treeherder-ui/pull/94, *jobs* is not presently being used.

Here is the before and after:

![thbrandnavbarcurrent](https://cloud.githubusercontent.com/assets/3660661/4764869/27c52e4c-5b2f-11e4-97ee-d57ce601d96d.jpg)

![thbrandnavbarproposed](https://cloud.githubusercontent.com/assets/3660661/4764873/2b9ceb7c-5b2f-11e4-9ac5-297fecd1402c.jpg)

Tested on Windows:
FF Release **33.0**
Chrome Latest Release **38.0.2125.104 m**

Adding @wlach for review and @edmorley for visibility.