There's more discussion and a few links on previous HN submissions: http://news.ycombinator.com/item?id=4016421 http://news.ycombinator.com/item?id=4016421 ht

There's more discussion and a few links on previous HN submissions: http://news.ycombinator.com/item?id=4016421 http://news.ycombinator.com/item?id=4016421 http://news.ycombinator.com/item?id=159213 http://news.ycombinator.com/item?id=159213