* test: add initial simple checker test
* fix: allow the 'commit' argument to be a Path too
* test: add bad commit messages required to fail verification

Acked-by: Joost Muller <Joost.Muller@tomtom.com>
Acked-by: Kevin de Jong (EHV) <Kevin.deJong@tomtom.com>
Acked-by: Rene Kempen <Rene.Kempen@tomtom.com>
Merged-by: Hopic 1.0.1.dev134+g2920beb