Add instructions for setting up SSL and HTTPS
Add instructions for setting up SSL and HTTPS

Fixes #220

Unfortunately I can't actually get this to work, due to an undiagnosed
problem with the official config files.

This *is* the way to go, assuming folks have or can find usable
configuration.

earldouglas/xsbt-web-plugin,melezov/xsbt-web-plugin,earldouglas/xsbt-web-plugin