In 2005 writer-director Rian Johnson made a memorable film called “Brick” which combined the private eye-crime noir genre with a high-school setting and made us start to wonder if Joseph Gordon Levitt was going to have a career past being the alien teenager on “3rd Rock from the Sun.” Now no one is wondering anymore as Levitt teams up again with the director for “Looper,” the year’s most ingenious and thought-provoking