Nick D’Aloisio, 17, of Britain, developed his news-reading app when he was only 15.Credit...Nadine Rupp/Getty Images One of Yahoo’s newest employees is a 17-year-old high school student in Britain. As of Monday, he is one of its richest, too. That student, Nick D’Aloisio, a programming whiz who wasn’t even born when Yahoo was founded in 1994, sold his news-reading app, Summly, to the company on Mo