Get all timers and set them in the _timers_values property

        :param pandas.DataFrame dataframe: the main dataframe with row results

def _get_all_timers(self, dataframe):
        """Get all timers and set them in the _timers_values property

        :param pandas.DataFrame dataframe: the main dataframe with row results
        """
        s = dataframe['custom_timers'].apply(json.loads)
        s.index = dataframe['epoch']
        for index, value in s.iteritems():
            if not value:
                continue
            for key, value in six.iteritems(value):
                self._timers_values[key].append((index, value))
                self.total_timers += 1
        del dataframe['custom_timers']
        del s