“Nightcrawler” is nothing short of a revelation in filmmaking. It features a powerhouse performance by Jake Gyllenhaal and contains characters and an atmosphere that completely is in service to its story. I think if Michael Mann had made either “Broadcast News” or “Network,” this is probably what it would look like.Before trailer: So, ready to prowl the night?After trailer: Well, as a great musical artist once said, “I love L.A.!”Gyllenhaal stars as Lou Bloom, a driven young man living in Los Angeles determined to do something great with his life.