Bug 1062827 - Change job result names for more clarity

This is the UI side change to fix Bugzilla bug [1062827](https://bugzilla.mozilla.org/show_bug.cgi?id=1062827).

In it we've agreed on these three result name changes:

* success
* testfailed -> **warnings**
* busted -> **failed**
* skipped
* exception -> **infra-failure**
* retry
* usercancel

For ease of grokking I still wonder if 'intrastructure-failure' might fit in the UI?

There is parallel work still to be done in treeherder-service and DB changes required for this commit to be landed. If I can get a local service running, I may investigate the server side. Otherwise one of the folks with full powers and access may need to do that part :)

But hopefully this saves a few minutes for you guys poking around on the UI side.

Running in its current state with no back end changes shuts off all the filter counts, to me that is expected since there are no matches.

(not fully) tested on Windows:
FF Release **33.0**
Chrome Latest Release **38.0.2125.104 m**

Adding @edmorley and @maurodoglio for review and general expertise.