On start of service create the /var/run/cube.

On some systems, /var/run is deleted on reboot. If it does not exist, these scripts will fail to start the cube programs.
See http://askubuntu.com/questions/303120/how-folders-created-in-var-run-on-each-reboot.
Merge pull request #1 from AndreasVoellmy/master

On start create folder `/var/run/cube`. Thanks to @AndreasVoellmy