Ignore SIGINT and SIGQUIT otherwise the user typing ^C or ^\ on the command line will kill the server/application.

We need to redirect STDOUT and STDERR, otherwise the server will keep the original FDs open which would break piping. (e.g. `spring rake -T | grep db` would hang forever because the server would keep the stdout FD open.)

Boot the server into the process group of the current session. This will cause it to be automatically killed once the session ends (i.e. when the user closes their terminal).