Add ability to upload custom SSL certificates

[Marak]

Some users may want to upload custom ssl certificates for their custom domains.

So far no one has asked yet.

As soon as it's requested we'll add the ability to upload custom ssl certs.

[Marak]

Looks like node supports SNI now, sweet!

https://nodejs.org/api/tls.html#tls_npn_and_sni

This should allow for using multiple certs on the same load balancer.

[Marak]

This should be added to https://github.com/bigcompany/http

[Chaz6]

I don't know if this should be a new bug or part of this bug, but it would be great to have the option to automatically provision SSL certificates using the free LetsEncrypt CA.