Growing up is hard. Killing a town full of zombies is harder. Or so the students of Cosa High School find in the raucous new film “Dance of the Dead.” The movie “Dance of the Dead” is the fast-paced, blood drenched — and often hilarious — story of several high school students from different social cliques banding together to save their town from the living dead. The film marks the auspicious debuts of many of the young cast members in the ensemble. It’s also the sophomore effort from Gregg Bishop, the award-winning director of the supernatural thriller “The Other Side.”