Rebecca Rubin Film and Media ReporterIn Netflix’s upcoming assassin thriller “The Killers,” director David Fincher does what David Fincher does best — which is to say the filmmaker delves deep into the mind of the deeply disturbed.The film, starring Michael Fassbender as a cold-blooded hitman who suddenly develops a conscience, is the kind of tense, edge-of-your-seat character study that harkens back to some of the director’s previous masterworks like “Se7en,” “Fight Club,” “Zodiac” and