Upgrading Font Awesome vendor files from 3.2.1 to 4.2.0

* updating vendor files
* updating class syntax (to new FA-based classes) for all UI elements
* correcting broken tests

cms/static/sass/elements/_layout.scss

@@ -72,7 +72,7 @@
             vertical-align: baseline;
           }
 
-          [class^="icon-"] {
+          .icon {
             display: inline-block;
             vertical-align: baseline;
           }