Dan Gilroy’s first feature film, “Night Crawler,” is a rare treat, a perfect thriller, a soufflé that rises as it should and keeps its superlatively fluffy texture from minute one to minute 117. But you stand warned, this film about a sleazy, nasty loser-drifter who has watched one too many TED talk about how to be wildly successful will not be as easy to digest. Jake Gyllenhaal, skinny, driven, with the smile a rattlesnake would have if it could