Merge https://github.com/gvilarino/play-with-docker into gvilarino_revert

www/assets/app.js

@@ -63,6 +63,8 @@
     KeyboardShortcutService.setResizeFunc($scope.resize);
 
     $scope.closeSession = function() {
+      // Remove alert before closing browser tab
+      window.onbeforeunload = null;
       $scope.socket.emit('session close');
     }