supervisor list only supadmin

sails/src/assets/scripts/modules/supervisor/views/header.html

@@ -32,7 +32,7 @@
               {{ 'students' | translate }}
             </a>
           </li>
-          <li>
+          <li ng-if="user.isSupAdmin == true">
             <a class="pointer" role="menuitem" tabindex="0" href="/app/#/supervisor/list">
               <i class="fa fa-users" aria-hidden="true"></i>
               {{ 'supervisors' | translate }}