It’s official: Apple is out of fashion at JCPenney. Three top proteges of former Penney CEO Ron Johnson — all of whom boasted stints at Apple on their resumes — exited the retailer today, The Post has learned. Chief Operating Officer Mike Kramer, Chief Talent Officer Daniel Walker and Chief Creative Officer Mike Fisher kicked off an exodus of high-profile Johnson hires that is expected to continue in the wake of his ouster, sources said. Kramer — who said publicly earlier this year that he “hated the culture” at Penney — resigned as interim CEO Mike Ullman this week began...