[Rack] letsencrypt

[Andy Isaacson]

Noisebridge has long been at the forefront of HTTPS technology - we were
one of the first dozen sites on the HSTS Preload list, for example.

Later this fall the https://letsencrypt.org CA will be going live.  I've
signed us up to be a beta site, and so as the rollout begins we'll
likely be transitioning to a letsencrypt certificate.  I'll send a PGP
signed message to this liast with the fingerprint when that happens, of
course. :)

-andy