Eileen DiFranco sang the hymns, prayed and took Communion as she had done at countless other Catholic Masses.But yesterday, for the first time, she led the service as an ordained priest - and received a warm reception from hundreds of Catholics and others."Nothing is impossible with our God," she told a congregation at the First United Methodist Church of Germantown. "Not even a woman priest."Applause rippled across the steamy sanctuary, where many fanned themselves with programs titled: "First Mass. Eileen DiFranco."DiFranco, 54, of Mount Airy, had participated in a July 31 ceremony that organizers say made her among the first...