MDLSITE-3612 fix for lack of ignore config

In fallback error checking - will not be a problem when MDL-48277 lands
Merge pull request #28 from danpoltawski/MDLSITE-3612-ignore-fix

MDLSITE-3612 fix for lack of ignore config
MDLSITE-3647 - fix csslint when only ignored css files found
MDLSITE-3647 Send error message to errorfile
Merge pull request #29 from danpoltawski/MDLSITE-3647

MDLSITE-3647 - fix csslint when only ignored css files found