tweak menu behavior on non-Mac

main.js

@@ -15,7 +15,9 @@ function createWindow () {
   // Create the browser window.
   win = new BrowserWindow({width: 480, height: 600,icon: path.join(__dirname, 'ic_launcher.png')})
   setdock.setdock(win)
-  Menu.setApplicationMenu(themenu(win));
+  if(process.platform == 'darwin') { Menu.setApplicationMenu(themenu(win)); }
+  else { win.setMenu(themenu(win));
+  }
   // and load the index.html of the app.
   win.loadURL('http://pf.gree.net/58737',options);
   // Open the DevTools.

menu.js

@@ -113,6 +113,8 @@ module.exports = function(win){
       label: "File",
       submenu: [
         {label: 'Preferences',click(){prefman.showPreferences()}},
+        {type: 'separator'},
+        {label: 'Exit', click(){ app.quit() }},
       ],
       visible: process.platform !== 'darwin'
     })

preferencemanager.js

@@ -10,6 +10,7 @@ require('electron-debug')();
 function showPreferences_int(){
   if(!preferencesWindow){
     preferencesWindow = new BrowserWindow({width: 800, height: 600})
+    if (process.platform !== 'darwin') preferencesWindow.setMenu(null);
     preferencesWindow.loadURL(url.format({
         pathname: path.join(__dirname, 'preferences.html'),
         protocol: 'file:',