Popcorn Biz reports: Fans of the “Twilight” films are going to have a little added story to sink their teeth into. The previous movie adaptations of Stephanie Meyer’s vamp-lit juggernaut have gone pretty much by the book, but with the final novel “Breaking Dawn” being broken into two feature films, screenwriter Melissa Rosenberg tells PopcornBiz she’s enjoying a little more leeway to add some…