GUI --Base Tooltip Service created.
      - tips will appear above the mouse when element is hovered over
      - tips disappear after mouse leaves element
      - positioning of tooltip is still WIP, testing of it was run in Sample View

Change-Id: Ic3be1235bf8d2d4bbf473f965e3a1f8c79ce9fc6
diff --git a/web/gui/src/main/webapp/app/view/topo/topoToolbar.js b/web/gui/src/main/webapp/app/view/topo/topoToolbar.js
index 192c18d..06ddc0c 100644
--- a/web/gui/src/main/webapp/app/view/topo/topoToolbar.js
+++ b/web/gui/src/main/webapp/app/view/topo/topoToolbar.js
@@ -20,6 +20,7 @@
  */
 
 (function () {
+    'use strict';
 
     // injected references
     var $log, tbs, api;