Added onebox support for articles on 2buntu.com blog.

*I hope I have done this right... Git can be tricky sometimes...*

I've written a onebox parser for the [2buntu.com](http://2buntu.com) blog. The onebox generated by the parser displays the title, author, and the first 400 characters from the article. Information is retrieved using 2buntu's public API (for which I need to update the documentation :smirk:).

Please let me know if I've done anything stupid.