TODO List for saferun:
- Add --env=paranoid: 
	Sets the enviornment to paranoid.
	This removes every enviournment varible except:
	PATH,HOSTNAME,MAIL,TERM,HOME
	It adds the following:
	USERNAME=<the users username>
	USER=<the users username>
	LOGNAME=<the users username>
- Add --noenv
	Empties the enviournment
- Add --set-env <envname>=<envsetting>
	Sets specified enviournment varible.
- Add --del-env <envname>
	Removes the specified enviournment varible.
- Add --limit-<name>=<setting>
	Set the limit specified.
	<name> can be:
		cpu, fsize, data, stack, core, rss, nproc,
		nofile, memlock
	The limit can be a number, or "inf"
- Add --nosuid
	Don't run the program if its setuid or setgid
