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/templates/html_error.html

@@ -7,7 +7,7 @@
 
       <div class="copy">
         <h2 class="title">
-          <i class="icon-warning-sign"></i>
+          <i class="icon fa fa-warning"></i>
           ${_("We're having trouble rendering your component")}
         </h2>