WASHINGTON, March 3 (UPI) -- U.S. Secretary of State Colin Powell announced Monday that Charlotte Beers, who was hired by his department to improve the United States' image in the Muslim world, is resigning. Her resignation will become effective in about two weeks, officials at the State Department told United Press International. Although Beers has come in for some harsh criticism from commentators and indicated at a Senate briefing last week that she found her job very daunting, Powell said she was leaving for health reasons. "Charlotte Beers, a key and vital member of my team, is leaving us shortly...