It's not been an easy road for Summit's remake of 1986's 'Highlander.' First they had Justin Lin ('Fast Five') on board to helm the film, but he departed. And then Summit brought in Juan Carlos Fresnadillo to take over directing duties. Fresnadillo seemed an odd choice for the project at first. Despite helming the 2007 horror sequel '28 Weeks Later,' he was much more well known, and well regarded…