Allow to hide center column on large screens

UI/WebServerResources/js/Common/navController.js

@@ -16,6 +16,7 @@
     $scope.activeUser = sgSettings.activeUser();
     $scope.baseURL = sgSettings.baseURL();
     $scope.leftIsClose = !$mdMedia(sgConstant['gt-md']);
+    $scope.centerIsClose = false;
 
     // Show current day in top bar
     $scope.currentDay = window.currentDay;
@@ -52,6 +53,9 @@
           $log.debug("toggle right is done");
         });
     };
+    $scope.toggleCenter = function() {
+      $scope.centerIsClose = !$scope.centerIsClose;
+    };
     // $scope.openBottomSheet = function() {
     //   $mdBottomSheet.show({
     //     parent: angular.element(document.getElementById('left-sidenav')),