Fixing an obscure error when parsing the changelog

https://github.com/KanoComputing/kano-repository-manager/issues/26
Changing 'versions' to more accurate 'builds'

dr list versions # is now deprecated
dr push kano-settings -v 1.2.2-1 # will no longer work

https://github.com/KanoComputing/kano-repository-manager/issues/40
Allow force-sync from a new URL

This will be useful for when the repo address has changed.