Add TLS support

[yuce]

Virtually all production level databases seem to support TLS. We need to support TLS in the server and clients. A user should be able to skip TLS verification when using self-signed certificates.

[jaffee]

consider using letsencrypt in the future to automatically get real certs. not for MVP. Go libraries already exist to do this (see how Caddy does it)

[benbjohnson]

I think Caddy used lego last time I checked but there's been a more standard implementation added to golang.org/x since then.

Here's the issue discussing adding it to stdlib: golang/go#17053

Here's the relevant repos:

https://godoc.org/golang.org/x/crypto/acme
https://godoc.org/golang.org/x/crypto/acme/autocert

[yuce]

This is already implemented, closing.