Add support for new fingerprint format

This will be ready to roll whenever Android/iOS is.

// FREEBIE

background.html

@@ -287,6 +287,13 @@
       <div class='key'>
         {{ #your_key  }} <span>{{ . }}</span> {{ /your_key  }}
       </div>
+      <div class='securityNumber'></div>
+  </script>
+  <script type='text/x-tmpl-mustache' id='security_number'>
+      <label> Security number </label>
+      <div class='key'>
+        {{ #chunks }} <span>{{ . }}</span> {{ /chunks }}
+      </div>
   </script>
   <!-- index -->
   <script type='text/x-tmpl-mustache' id='group_info_input'>