Determines wether the response's meta data contains the keyword
        'article'

        :param obj response: The scrapy response
        :param dict site_dict: The site object from the JSON-File

        :return bool: Determines wether the reponse's meta data contains the
                      keyword 'article'

def meta_contains_article_keyword(self, response, site_dict):
        """
        Determines wether the response's meta data contains the keyword
        'article'

        :param obj response: The scrapy response
        :param dict site_dict: The site object from the JSON-File

        :return bool: Determines wether the reponse's meta data contains the
                      keyword 'article'
        """
        contains_meta = response.xpath('//meta') \
            .re('(= ?["\'][^"\']*article[^"\']*["\'])')

        if not contains_meta:
            return False
        return True