* Gatlin, 35, wins thrilling race in 9.
92 seconds * Bolt third in final individual event * Young American Coleman takes silver * Crowd boos Gatlin over doping past By Mitch Phillips LONDON, Aug 6 (REUTERS) Justin Gatlin ruined Usain Bolt's farewell party when the 35-year-old American won the world 100 metres title, beating the Jamaican superstar into third and sparking a chorus of boos from a London crowd unhappy with his doping past.