IPC setup for windows & remove old updater code

finder.js

@@ -4,7 +4,6 @@ const Menu = electron.Menu
 
 var finderWindow = null
 
-var appQuit = false
 app.on('ready', function () {
   if (process.platform === 'darwin') {
     app.dock.hide()
@@ -15,10 +14,4 @@ app.on('ready', function () {
   Menu.setApplicationMenu(menu)
 
   finderWindow = require('./atom-lib/finder-window')
-
-  finderWindow.on('close', function (e) {
-    if (appQuit) return true
-    e.preventDefault()
-    finderWindow.hide()
-  })
 })