Add session close button

www/assets/app.js

@@ -32,6 +32,10 @@
         $scope.socket.emit('viewport resize', geometry.cols, geometry.rows);
       }
 
+      $scope.closeSession = function() {
+        $scope.socket.emit('session close');
+      }
+
       $scope.upsertInstance = function(info) {
             var i = info;
             if (!$scope.idx[i.name]) {

www/index.html

@@ -26,6 +26,7 @@
                   md-whiteframe="4" layout="column">
 
                 <md-toolbar class="md-theme-indigo">
+                  <md-button class="md-warn md-raised" ng-click="closeSession()">Close session</md-button>
                   <h1 class="md-toolbar-tools">Instances</h1>
                 </md-toolbar>
                 <md-content layout-padding>