Implemented SSH keepalive; removed TCP keepalive
Transform hop-by-hop headers (using logic from httputil.ReverseProxy)
Performance fixes for http proxy: don't use deadline timeouts, use proper origin server timeout, allow for many more than the default number of idle persistent conns per origin host
Explicit timeouts for server API HTTPS requests
Merge pull request #7 from rod-hynes/master

Fixes and tweaks made while testing (web browsing via the local HTTP proxy interface)