Respond with given status and text content

        :type text: str
        :param text: text to return

        :type status: int
        :param status: status code to return

        :type headers: dict
        :param headers: dictionary of headers to add to response

        :returns: itself
        :rtype: Rule

def text(self, text, status=200, headers=None):
        '''
        Respond with given status and text content

        :type text: str
        :param text: text to return

        :type status: int
        :param status: status code to return

        :type headers: dict
        :param headers: dictionary of headers to add to response

        :returns: itself
        :rtype: Rule
        '''
        self.response = _Response(status, headers, text.encode('utf8'))
        return self