For more details see the post on my blog http://www.dotnet-rocks.com/2015/05/04/writing-an-electron-atom-shell-app-using-angular-and-es6/
You can package your app by using gulp transpile-app && gulp package
The you can copy the app.asar
file within the installed electron app by invoking
cp dist/app.asar /Application/Electron.app/Contents/Resources
Ensure that you've removed the default app within the Resources folder
in order to make your app the main entry point