Split text into a list of cells.

def split(self, text):
        """Split text into a list of cells."""

        import re
        if re.search('\n\n', text):
            return text.split('\n\n')
        elif re.search('\r\n\r\n', text):
            return text.split('\r\n\r\n')
        else:
            LOGGER.error("'%s' does not appear to be a 'srt' subtitle file",
                         self.filename)
            sys.exit(1)