Written by Max Landis and Directed by Nima Nourizadeh (“Project X”), “American Ultra” is a gleefully gory action comedy about a small town stoner who, unbeknownst to him, is a highly trained CIA operative. Mike (Jesse Eisenberg) spends his time getting high and doodling a comic about a monkey astronaut but when a customer utters a strange sequence of words to him, Mike’s hitherto suppressed CIA…