Update method signature in server example
Make server example register with proper port syntax.

Before, you needed to specify the port without a colon and the
service was registered in the same way.
Add http error responses.
Add Procfile, for easy development env setup.
Serve a TLS port alongside unencrypted HTTP.
IN PROGRESS: SSL Support
Add SNI-based HTTPS routing.

Uses hardcoded key files for now. Relies on the inconshreveable/go-vhost
module to the the SNI parsing.