Admin UI: use Exo 2 font-face locally distributed instead the one from CDN

In index.html we link to the font from Google CDN:

<link href="//fonts.googleapis.com/css?family=Exo+2:300,300italic,400,400italic,600,600italic" rel="stylesheet"
          type="text/css">

In order to avoid need to internet access and avoid to load external resources in general, we should download this font locally and make it part of UPS console distribution.

Link to font in Google Fonts:
http://www.google.com/fonts/specimen/Exo+2

Font License: SIL Open Font License, 1.1
http://scripts.sil.org/cms/scripts/page.php?item_id=OFL_web