Rom DuPlain

On further thought, the `poorman kill` exit code can be 0 when there's nothing to kill, but it was called correctly. Exit code 2 would mean `.poorman-kill` does not exist....

An alternative approach would be a polling loop which checks each PID to see that the process stopped, then take another interrupt from the user to send a SIGKILL. `docker-compose`...

cc: @amontalenti