Support automatic listening on Windows

[fbbdev]

On windows (especially with Microsoft IIS) the FastCGI socket is still passed as the stdin handle, but the handle is not 0 (like on POSIX systems).
It can be obtained by a call to GetStdHandle(STD_INPUT_HANDLE) from kernel32.dll. This currently requires a dependency on a native extension.

[fbbdev]

The problem should be partially resolved by listening on process.stdin in place of { fd: 0 }. I still don't know how to check whether the stdin handle is a socket or pipe on Windows (isServer() still not working).