HARRISBURG, Pa. — Three men who have been serving life sentences since they were juveniles won a fresh chance to convince judges they deserve to be resentenced under a decision Thursday by the federal appeals court based in Philadelphia. The 3rd U.S. Circuit Court of Appeals said there was at least some reason to think last year’s U.S. Supreme Court decision in the case of Miller v. Alabama, throwing out mandatory life without parole sentences for juveniles, should be applied retroactively. The court …