Service worker to connect to WNS

[okdistribute]

Talked with @elmasse about this:

We need a service worker that you can put in your app with complete access to the wireline naming service, in case you want to embed your app outside of Launchpad.

Launchpad should be using this service worker, too.

Stretch goal would be to have a neutral specification for the naming service, which the WNS implements.