I certainly can tell you about it, because robrenaud directed me to one in this comment: http://news.ycombinator.com/item?id=3508005 http://news.ycombinator.co

I certainly can tell you about it, because robrenaud directed me to one in this comment: http://news.ycombinator.com/item?id=3508005 http://news.ycombinator.com/item?id=3508005. I have just tested it and it does exactly what I asked for.