(Reuters) – Comedian Jay Leno said an emotional goodbye to the “Tonight Show” on Thursday with a star-studded farewell led by actor Billy Crystal, after hosting the NBC late night program for more than 20 years and handing the reins over to Jimmy Fallon. Leno, 63, who took over one of U.S. broadcast television’s marquee programs in 1992 from Johnny Carson, came out to a standing ovation from the audience of friends and family, shaking […]