stathat.go
func PostValueTime(statKey, userKey string, value float64, timestamp int64) error {
	return DefaultReporter.PostValueTime(statKey, userKey, value, timestamp)
}
func PostValueTime(statKey, userKey string, value float64, timestamp int64) error {
	return DefaultReporter.PostValueTime(statKey, userKey, value, timestamp)
}
// Using the classic API, posts a value to a stat at a specific time using DefaultReporter.