stats-rollup css tweaks. fixes gh-46.

Now that we're displaying stats-rollup in Nirvana mode, it's very hard
to read. This commit makes the UI more readable while in Nirvana mode,
so the app remains usable.
(gh-43) icon updates
fix weather icon size

Now that the original icons are larger (60px x 60px), specifically set
the size they should be on the radiator.
remove unused progress-danger and infinity styles
use `background-size: cover` for nirvana image
rename bootstrap.min.js to match convention

Rename bootstrap.min.js to bootstrap-3.1.1.min.js to follow
vendored js file naming convention.
implement icons for showing the job status

Prior to this commit, Waylon's primary means for communicating a job's
state is with colors. However, that makes Waylon unusable for any team
members that might be colorblind.

This commit implements Glyphicons for showing the job status next to
the job stability (weather) icon. For example: in addition to a table
row being green for a successful job, a checkmark is now also displayed.

This resolves gh-43.
use 'eta.png' for showing remaining build time

Prior to this commit, we used the Glyphicon Halflings included in
Bootstrap. As of this commit, I have paid for a royalty-free Glyphicons
license and have committed a higher-resolution image.
Merge pull request #47 from rji/ui-tweaks

UI tweaks