Extracts the Rss Feed and initiates crawling it.

        :param obj response: The scrapy response

def parse(self, response):
        """
        Extracts the Rss Feed and initiates crawling it.

        :param obj response: The scrapy response
        """
        yield scrapy.Request(self.helper.url_extractor.get_rss_url(response),
                             callback=self.rss_parse)