proxy protocol support

[bungle]

Add support for proxy protocol (for testing and proxying purposes): http://www.haproxy.org/download/1.8/doc/proxy-protocol.txt

See Also: http://nginx.org/en/docs/http/ngx_http_core_module.html#listen http://nginx.org/en/docs/http/ngx_http_realip_module.html#real_ip_header