stathat.go
func (r *BasicReporter) PostValueTime(statKey, userKey string, value float64, timestamp int64) error {
	x := newClassicStatValue(statKey, userKey, value)
	x.Timestamp = timestamp
	r.add(x)
	return nil
}
func (r *BasicReporter) PostValueTime(statKey, userKey string, value float64, timestamp int64) error {
	x := newClassicStatValue(statKey, userKey, value)
	x.Timestamp = timestamp
	r.add(x)
	return nil
}
// Using the classic API, posts a value to a stat at a specific time.