uvio needs tests for pipes on windows

[alexcrichton]

I wrote a few, but they're all failing. I wasn't even able to create a pipe without getting EACCES, so I'm probably just doing something wrong (or I don't know what a named pipe is on windows).

We would ideally like to rename net::unix to something along the lines of pipe and allow usage for all users (not just unix ones), but this involves figuring out how to test it first.