0.24.7: Support listening on unix sockets (#9)
If `host` in the config fails to parse as an IP address it will trying to bind to a Unix socket. Tested with Caddy and cURL by doing cURL: `curl --unix-socket /tmp/calagopus.sock http://localhost/` Caddy: `caddy reverse-proxy --from :8080 --to unix//tmp/calagopus.sock`