Migrating to v1.2: add class names to divs with ids

For:
ebiwd/EBI-Framework#85 (comment)

sample-site-v1.2/index.html

@@ -214,21 +214,21 @@ <h4>See also</h4>
     <footer>
       <!-- Optional local footer (insert citation / project-specific copyright / etc here -->
 <!--
-      <div id="local-footer">
+      <div id="local-footer" class="local-footer">
         <div class="row">
           <span class="reference">How to reference this page: ...</span>
         </div>
       </div>
  -->
       <!-- End optional local footer -->
 
-      <div id="global-footer">
+      <div id="global-footer" class="global-footer">
 
-        <nav id="global-nav-expanded" class="row">
+        <nav id="global-nav-expanded" class="row global-nav-expanded">
           <!-- Footer will be automatically inserted by footer.js -->
         </nav>
 
-        <section id="ebi-footer-meta" class="row">
+        <section id="ebi-footer-meta" class="row ebi-footer-meta">
           <!-- Footer meta will be automatically inserted by footer.js -->
         </section>