The underdog story of this Academy Award season centers around a yak that marks the nation of Bhutan’s first Oscars submission of the century. Filming “Lunana: A Yak in the Classroom” in the heart of the Himalayan mountain range was rife with challenges, including the use of cameras fueled by solar-powered batteries. The movie itself centers around a teacher assigned to a remote school in an area where winters are unforgiving and amenities are few. But getting the film in front of the Academy of Motion Picture Arts and Sciences became a daunting hike of its own that’s been years in the making….