Renowned Tiger Cub Robert Citrone's Discovery Capital Management blew its hedge fund competitors out of the water in 2013. It was one of the world's top-performing hedge fund managers for the year, a feat in itself in what proved to be a dreadful year for macro funds, and was the front-runner in the smaller league of Tiger Cubs. Investors credit short bets against emerging-markets economies early last year for the firm's outstanding gains. In the third quarter three of Discovery's four largest new positions were exchange-traded funds. Apple and Google were also among its top ten holdings…