Duckduckgo.com support; QR code support; copyright years calculation.

1) fixed search on site in case of using duckduckgo.com search engine
2) added qr code engine from http://neocotic.com/qr.js/
![3](https://f.cloud.github.com/assets/726941/2492912/f11c77be-b265-11e3-85bd-b1001341766f.png)
 post publishing
3) updated footer to show years of