Writer-director James Wan may have made his name with the ultra-gory “Saw” franchise, but he is just as comfortable with old-fashioned suspense. In fact, it seems that Wan now favors movies that are built on slow-burning psychological horror. Wan’s first film of 2013, “The Conjuring,” was the best horror movie of the year. His second, “Insidious: Chapter 2,” is less striking, but still intense and entertaining.