NEW YORK (Reuters) – Olympic gold medalist Gabrielle Douglas, not yet 18, will publish her second memoir next month, publisher Zondervan said on Tuesday. Douglas, 17, a gold medal winner at the 2012 Summer Olympics in both team and individual all-around gymnastics competition, will publish "Raising the Bar", a follow-up to her 2012 best-selling memoir "Grace, Gold & Glory: My Leap of Faith", on April 30, the publishers said in a release. Zondervan is a division of HarperCollins that specializes in Christian-oriented books. …