Add support for OCB (and other GitHub forks)

See commit a808547.

That's becaus it's written in bash-crypt ;-)
L1: sh does not support `<<<` at L3, must use bash instead
L2: set a default to ODOO_REPO if it comes empty
L3: split "org/repo" two parts into the REPO array, so that REPO[0]="org" and REPO[1]="repo"

You can check this playing with the script in your terminal.