The previous submission (of several) with extensive discussion about two days ago: http://news.ycombinator.com/item?id=5230585 http://news.ycombinator.com/item

The previous submission (of several) with extensive discussion about two days ago: http://news.ycombinator.com/item?id=5230585 http://news.ycombinator.com/item?id=5230585