NEW YORK (Reuters) - Coming off a year in which U.S. toy sales fell 2 percent, toymakers and buyers at the 109th American Toy Fair in New York are looking for the elusive runaway hit that failed to materialize in 2011. The industry has reached back to the past hoping Ninja turtles and caring stuffed bears from the 1980s, accessories that play with the hottest gadgets of today and a cuddly dog that has scored fame on Facebook, will turn around flagging sales this year. ...