Unix pipes (named pipes on windows) need a 1:1 implementation

[alexcrichton]

This is an issue to track progress on the implementation of unix pipes (named pipes for windows) in 1:1 mode.

This will involve filling out the unix_bind and unix_connect functions inside of libnative/io/mod.rs

[Geal]

I am actually working on it because I need unix sockets right now, but the code is not much tested for now. I just sent it to my fork to work on it from elsewhere.

[Geal]

Ok, the code is now clean enough to warrant some testing :)

Here are some gists with working code to test those features: https://gist.github.com/Geal/8378309

It builds and works fine on an Ubuntu machine, I will now test it on OSX.