Director: Marc Forster Writer: Matthew Michael Carnahan, Drew Goddard, Damon Lindelof, J. Michael Straczynski Starring: Brad Pitt, Mireille Enos, Daniella Kertesz   Brad Pitt is working his butt off to save his family, himself and the world, in that order. We know he will do it, but how? World War Z could have been a…