def render
      create_epub do
        temp_file = Tempfile.new("ocf")
        self.save(temp_file.path)
        return temp_file.read
      end
    end
def render
      create_epub do
        temp_file = Tempfile.new("ocf")
        self.save(temp_file.path)
        return temp_file.read
      end
    end
Stream OCF

 @return [String] streaming output of the zip/epub file.