refactor file structure

lib/finder-app.js

@@ -0,0 +1,17 @@
+const electron = require('electron')
+const app = electron.app
+const Menu = electron.Menu
+
+var finderWindow = null
+
+app.on('ready', function () {
+  if (process.platform === 'darwin') {
+    app.dock.hide()
+  }
+
+  var template = require('./atom-lib/menu-template')
+  var menu = Menu.buildFromTemplate(template)
+  Menu.setApplicationMenu(menu)
+
+  finderWindow = require('./atom-lib/finder-window')
+})