update to d-project's qrcode.js r327

The original qrcode.js has changed[1] since it has been added to this project. I ported pull request jeromeetienne#9 onto it and so far it works fine.

[1]: https://code.google.com/p/d-project/source/browse/trunk/misc/qrcode/js/qrcode.js

Author: ccoenen