previous discussions on hn- http://news.ycombinator.com/item?id=376573 http://news.ycombinator.com/item?id=376573 http://news.ycombinator.com/itemid=381128 ht

previous discussions on hn- http://news.ycombinator.com/item?id=376573 http://news.ycombinator.com/item?id=376573 http://news.ycombinator.com/itemid=381128 http://news.ycombinator.com/itemid=381128 http://news.ycombinator.com/item?id=485239 http://news.ycombinator.com/item?id=485239