Remove tray menu on restartApplication() (close #10)

www/js/main.js

@@ -41,6 +41,7 @@ function shadeColor2(color, percent) {
 }
 
 function restartApplication() {
+    removeTrayMenu();
     window.location = "index.html";
 }
 

www/js/platform.js

@@ -16,6 +16,10 @@ var setTrayMenu = function (items) {
 
 }
 
+var removeTrayMenu = function () {
+
+}
+
 function initCordova() {
     platform_type = "cordova";
 
@@ -78,6 +82,11 @@ function initNW() {
         icon: 'www/img/logo_64.png'
     });
 
+    removeTrayMenu = function () {
+        nw_tray.remove();
+        nw_tray = null;
+    }
+
     setTrayMenu = function (items) {
         var menu = new nw.Menu();
         menu.append(new nw.MenuItem({