text.go
func (m *CirconusMetrics) RemoveText(metric string) {
	m.tm.Lock()
	defer m.tm.Unlock()
	delete(m.text, metric)
}
func (m *CirconusMetrics) RemoveText(metric string) {
	m.tm.Lock()
	defer m.tm.Unlock()
	delete(m.text, metric)
}
// RemoveText removes a text metric