On Monday night Bostonist had a chance to see Happy Endings, the latest film from writer/director Don Roos (Bounce, the Opposite of Sex), at the Landmark Kendall theater, and also stuck around after the film for a Q+A with actor Jason Ritter. Usually the title Happy Endings would allude to something a bit more lascivious or perverted, but in this case there were no lecherous old men being "fully serviced". The rather convoluted basis......