HTTPS support?

[git-ingham]

Sorry for creating so many issues all at once.

In the long run, we are going to need https support. I know that node.js supports https, so, hopefully, this means just exposing the configuration through the command-line options and config file.

[jenglish]

I generally run Express applications behind an NGINX proxy if HTTPS is needed (which, AIUI, is the recommended procedure).

Haven't tested if ssptool server actually works in that configuration though, will look into it when I get a chance ...