Application only working when bankai is serving

Hello!
I really like choo and think this project is a great idea and opportunity to make my first contact with electron. 😄

I ran the generator with npx, as suggested, and then ran `npm run build` inside the generated folder. After opening the generated application inside `dist`, it only showed up a blank window.

I read the codebase to try to figure out what was happening and the findings/fixes resulted in [this PR](https://github.com/choojs/create-choo-electron/pull/3).

Now if I run `npm run dev` I can see the "Choo choo!" text, but if I open the generated app I can only see a blank page (unless I am serving the page with `npm run dev`). Is that expected?

I'm running on node v6.11.2 and osx 10.12.4.