Qrcode for #593

i've put the ignore list to queries like 'qr code reader' etc, let me know if that is enough or we ignore anything what follows these terms. Also i think we should move this from forever alone, to the goodies repo? :smiley: 
It might help to add the stuff in the "Meanings" tab, too:

![screen shot 2014-09-03 at 3 06 00 pm](https://cloud.githubusercontent.com/assets/81969/4139718/6e9ceed6-339d-11e4-98ee-d775d767f9fc.png)

So adding "algorithm" and "decomposition" should be worthwhile.