Add image to README

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com> (github: titanous)
Merge pull request #6 from miracle2k/tiny

A collection of small fixes
Serve a TLS port alongside unencrypted HTTP.
Add SNI-based HTTPS routing.
Fix spelling in comment.
Support custom service name in client example.

This evolves in more towards a real RPC command line client.
Allow setting domain cert/key via RPC client.
Store TLS keypair per domain in etcd, use for serving.