Add support for proxying unix domain sockets (JRuby)

[dblock]

Similar to #31, but which works on JRuby. Looks like this requires eventmachine support first.

[mattbeedle]

+1

[gorkunov]

+1

[igrigorik]

I think belongs on EM repo... as I can't do much until we have that.

[acds]

+1, Any chance anyone can influence EM ?

[dblock]

I opened eventmachine/eventmachine#459, I am surprised I didn't before cause I went down the path of trying to figure out an implementation for the call in Java.

If someone wants to dig a bit and add to that issue, that'd be great.

[Ch4s3]

+1