LYTHAM ST ANNES, England (Reuters) - World number two Rory McIlroy hit out at slow play after launching his title challenge at the 141st British Open with a three-under 67 on Thursday. The 23-year-old Northern Irishman, who hit a spectator on the head after going out of bounds at the 15th, said some of his playing rivals needed to put their foot on the gas out on the course. "This is an issue ...