By Jennifer Piacenti Phillies slugger hints that new manager means more opportunities for Bryson Stott and other younger players. After firing Joe Girardi Friday morning, the Phillies stormed back into the Wild Card conversation, sweeping the Los Angeles Angels and improving their record to 25-29. They are now 3-0 behind new manager Rob Thomson. Philadelphia put up big offense (26 runs across three games, for an average of nearly nine runs per game), and saw hits from its biggest stars as well as rookies. Bryce Harper hit a game-tying grand slam Sunday and rookie Bryson Stott hit the three-run…