Request global stats for a give game.

        appID: The app ID
        count: Number of stats to get.
        names: A list of names of stats to get.
        startdate: The start time to gather stats. Unix timestamp
        enddate: The end time to gather stats. Unix timestamp
        format: Return format. None defaults to json. (json, xml, vdf)

def get_global_stats_for_game(self, appID, count, names, startdate,
            enddate, format=None):
        """Request global stats for a give game.

        appID: The app ID
        count: Number of stats to get.
        names: A list of names of stats to get.
        startdate: The start time to gather stats. Unix timestamp
        enddate: The end time to gather stats. Unix timestamp
        format: Return format. None defaults to json. (json, xml, vdf)

        """
        parameters = {
            'appid' : appID,
            'count' : count,
            'startdate' : startdate,
            'enddate' : enddate
            }
        count = 0
        for name in names:
            param = "name[" + str(count) + "]"
            parameters[param] = name
            count += 1
        if format is not None:
            parameters['format'] = format
        url = self.create_request_url(self.interface, 'GetGlobalStatsForGame', 1,
            parameters)
        data = self.retrieve_request(url)
        return self.return_data(data, format=format)