Checks any given response on being an article and if positiv,
        passes the response to the pipeline.

        :param obj response: The scrapy response
        :param str rss_title: Title extracted from the rss feed

def article_parse(self, response, rss_title=None):
        """
        Checks any given response on being an article and if positiv,
        passes the response to the pipeline.

        :param obj response: The scrapy response
        :param str rss_title: Title extracted from the rss feed
        """
        if not self.helper.parse_crawler.content_type(response):
            return

        yield self.helper.parse_crawler.pass_to_pipeline_if_article(
            response, self.ignored_allowed_domain, self.original_url,
            rss_title)