- Add support for super users

- Add a super user API
- Add a super user interface

static/directives/header-bar.html

@@ -65,6 +65,7 @@
           </a>
         </li>
         <li><a ng-href="/organizations/" target="{{ appLinkTarget() }}">Organizations</a></li>
+        <li ng-if="user.super_user"><a href="/superuser/"><strong>Super User Admin Panel</strong></a></li>
         <li><a href="javascript:void(0)" ng-click="signout()">Sign out</a></li>
       </ul>
     </li>