Allow URLs as QR content.
Allow options for QR code.
- corrected cahce output-dir
- added options to twig extensions
- added options to filename generator (SHA)
- added stuff necessary to overlay images onto QR code
- properly implemented resizing of overlay according to size option
added download action for barcodes codes
Fixed readme. Added optional config for overlay images.
Added noCache option.
Merge pull request #14 from dpokleka/master

QR Code overlays