Add unSYSTEM Bitcoin conference to bitcoin.org

Hi!

I represent a team of organisers for the Bitcoin conference in Europe titled:

Bitcoin 2013: unSYSTEM - See http://unsystem.net

I've organised the last 2 conferences held in Prague (http://bitgroups.org/) and the last one in London called bitcoin2012. Both conferences were a success with 150 and 400 attendees respectively and were featured on the bitcoin.org homepage.

Vice magazine wrote about bitcoin2012:

  http://www.vice.com/en_uk/read/printable-guns-grey-matters-and-masked-hackers

It would be a nice gesture to put Europe's largest Bitcoin event alongside the largest US event for Bitcoin.

unSYSTEM represents the voice of a growing side of Bitcoin users, who see Bitcoin as primarily a social tool.