Given his notorious history of heists one might assume that Gerald Blanchard would stay out of sight. Or at least keep his mouth shut. Yet Blanchard’s narcissism, for it can be labeled as nothing else, will not allow him to stay mum about his life of crime. Thankfully, filmmaker Landon Van Soest gives Blanchard just enough rope to air out his dirty laundry for the whole world to enjoy in the new documentary “The Jewel Thief,” premiering this week on Hulu.