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/settings.html

@@ -98,7 +98,7 @@ CMS.URL.UPLOAD_ASSET = '${upload_asset_url}';
                 %>
                 <a title="${_('Send a note to students via email')}"
                     href="mailto:someone@domain.com?Subject=${email_subject}&body=${email_body}" class="action action-primary">
-                    <i class="icon-envelope-alt icon-inline"></i>${_("Invite your students")}</a>
+                    <i class="icon fa fa-envelope-o icon-inline"></i>${_("Invite your students")}</a>
               </li>
             </ul>
           </div>