GUI -- Directive for tooltips on icon elements created. Control buttons on table views now have tooltips.

Change-Id: I77d73efa25bfc3adeb5519d5ca087475f5523c7d
diff --git a/web/gui/src/main/webapp/app/view/device/device.js b/web/gui/src/main/webapp/app/view/device/device.js
index baf1e96..1f8f1cfb 100644
--- a/web/gui/src/main/webapp/app/view/device/device.js
+++ b/web/gui/src/main/webapp/app/view/device/device.js
@@ -203,6 +203,9 @@
             ns = _ns_;
             var handlers = {};
             $scope.panelData = [];
+            $scope.flowTip = 'Show flow view for selected device';
+            $scope.portTip = 'Show port view for selected device';
+            $scope.groupTip = 'Show group view for selected device';
 
             function selCb($event, row) {
                 selRow = angular.element($event.currentTarget);