Added CssColorChecker as an example that uses more than regex for validation
Added CssColorChecker as an example that uses more than regex for validation

wikimedia/operations-debs-python-jsonschema,Julian/jsonschema,jamesmarva/jsonschema,eodolphi/jsonschema,varunarya10/jsonschema,python-jsonschema/jsonschema,sightmachine/jsonschema,eodolphi/jsonschema,dnephin/jsonschema,wikimedia/operations-debs-python-jsonschema,Julian/jsonschema,mathewmarcus/jsonschema