Show a server disconnected message when user is not able to connect to

server.

www/assets/app.js

@@ -10,6 +10,7 @@
 		$scope.selectedInstance = null;
         $scope.isAlive = true;
         $scope.ttl = '--:--:--';
+        $scope.connected = true;
 
       angular.element($window).bind('resize', function(){
         if ($scope.selectedInstance) {
@@ -123,6 +124,13 @@
                     });
                 });
 
+                socket.on('connect_error', function() {
+                    $scope.connected = false;
+                });
+                socket.on('connect', function() {
+                    $scope.connected = true;
+                });
+
                 $scope.socket = socket;
 
 				var i = response.data;

www/assets/style.css

@@ -42,3 +42,7 @@ md-card-content.terminal {
     margin-bottom: auto;
     margin-top: 50px;
 }
+
+.disconnected {
+    background-color: #FDF4B6;
+}