At build time, concat vendor/app scripts and async load in

[addyosmani]

Basically, over in this: https://github.com/insin/react-hn/blob/master/src/views/index.ejs#L37

We want to concatenate both vendor and app scripts into a single bundle so at build time instead of:

    <script src="build/vendor.js"></script>
    <script src="build/app.js"></script>

We're just doing:

    <script src="build/bundle.js" async></script>

to avoid blocking.

An alternative to this approach would be ignoring concatenation and just focusing on our HTTP/2 story. I haven't deployed HTTP/2 with push support on AppEngine before, but could learn how to do so if we wanted it.

[insin]

IIRC we should be able to disable vendor splitting in the nwb config, and if I'm not recalling correctly, I'll make it possible and publish a new release with that.

[addyosmani]

I might be reading it wrong (probably am!) but couldn't find a way to disable vendor splitting over in https://github.com/insin/nwb/blob/master/docs/Configuration.md#webpack-object.