PurgeCache maybe need a little '/'

Maybe, to follow conventions and define directories without terminate it with a slash, a ‘/’ it’s needed after %s for CSVDir ?

func (c CSVPurger) PurgeCache() {
curtime := time.Now()
fname := fmt.Sprintf(“%s%d-%s-%d-%d-%d.csv”, config.AnalyticsConfig.CSVDir, curtime.Year(), curtime.Month().String(), curtime.Day(), curtime.Hour(), curtime.Minute())

Feel free to submit a pull request.