Returns a data frame of all tags in origin.  The DataFrame will have the columns:

         * repository
         * tag

        :returns: DataFrame

def tags(self):
        """
        Returns a data frame of all tags in origin.  The DataFrame will have the columns:

         * repository
         * tag

        :returns: DataFrame
        """

        tags = self.repo.tags
        df = DataFrame([x.name for x in list(tags)], columns=['tag'])
        df['repository'] = self._repo_name()

        return df