Previous submission, with lots of discussion on the main page: http://news.ycombinator.com/item?id=5245321 http://news.ycombinator.com/item?id=5245321 (Hat ti

Previous submission, with lots of discussion on the main page: http://news.ycombinator.com/item?id=5245321 http://news.ycombinator.com/item?id=5245321 (Hat tip to you for submitting the canonical URL.)