Bug 1162706 - Add UI access between treeherder and perfherder

[tojon]

This work fixes Bugzilla bug 1162706.

This converts our inert Treeherder and Perfherder 'logos' into equivalent nav menus, so you can switch back and forth between platforms, and discover Perfherder from Treeherder.

Here's current (inert logo):

Here's Treeherder proposed (menu posted):

We consciously use the same style as our other right hand nav bar buttons, to cue the user it is navigable, and for consistency. I don't see a downside to that approach.

Here's the proposed tooltip for both:

Here's Perfherder proposed (menu posted):

The only workflow I discovered that doesn't work as expected, is if you use the Perfherder menu to navigate to Treeherder, and then hit 'back' on your browser, we just reload Treeherder instead of reloading Perfherder. The other direction is fine. I wonder if it related to our hash routing or my -ui local server development configuration. I will poke around a bit more on that. That being said, you can use the menu to easily navigate back.

Otherwise everything seems fine.

Tested on OSX 10.10.3:
FF Release 37.0.2
FF Nightly 40.0a1
Chrome Latest Release 42.0.2311.135 (64-bit)

Adding @wlach for review and @jmaher for visibility.

[tojon]

Retiring these bootstrap overrides, they are no longer needed.

[wlach]

\o/

[tojon]

I had one other tweak to make also; to get the treeherder link working correctly which I think will mimic its behavior on our instances. From (web-server.js) treeherder.html to /# (vagrant). It seems fine in vagrant, so I will merge now.