Collecting all output from shell commands

General Usage
7

It looks like this works.

function communicate(cmd::Cmd, input)
    inp = Pipe()
    out = Pipe()
    err = Pipe()

    process = run(pipeline(cmd, stdin=inp, stdout=out, stderr=err), wait=false)
    close(out.in)
    close(err.in)

    stdout = @async String(read(out))
    stderr = @async String(read(err))
    write(process, input)
    close(inp)
    wait(process)
    return (
        stdout = fetch(stdout),
        stderr = fetch(stderr),
        code = process.exitcode
    )
end

@show communicate(`cat`, "hello")
@show communicate(`sh -c "cat; echo errrr 1>&2; exit 3"`, "hello")
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