Add shellshock, game written in bash

Created by Øyvind 'bolt' Hvidsten <bolt@dhampir.no>, downloaded from
<http://www.dhampir.no/stuff/bash/shellshock>.

c515a3c4-4825-11e4-804a-c80aa9e67bbd
shellshock: Add "stty sane" to reset the terminal when done

af4f2644-4827-11e4-a505-c80aa9e67bbd