In version.sh, replaced /bin/bash with /bin/sh, for FreeBSD compatibility.
(No bash by default, and it's installed in /usr/local/bin/bash if so.)
If bash is required over sh for some reason, we can use '#!/usr/bin/env bash' instead.
Merge pull request #302 from DouglasHeriot/master

Fix FreeBSD compatibility with version.sh – no bash