Install script for Ubuntu/Debian and Gitlab 7-0-stable

Hello,

I had a need to update my install script when installing on a new VPS.  This script may not be perfect -- it probably needs more testing outside of my environments -- but I hope it helps someone else.

Relates to #135, #136.  I have not had a chance to try igitlab, since this script repeatedly works well for me -- but I am glad to have any or all of it merged so that it's easier to keep current.

Thanks all for your works!