Fix test

Improve invalid font path handling

Fix check

Throw proper exception when required package is not installed

Always make sure colors are int values

Merge pull request endroid#191 from sprain/writer-registry

Move createWriterRegistry to constructor of QrCode

Retrieve data via QR code

Merge pull request endroid#189 from sprain/bugfix-imagecopyresampled

Force integer params in imagecopyresampled

Fix error correction level handling

Fix types and add test