func (g *Glg) Logf(format string, val ...interface{}) error {
	return g.out(LOG, format, val...)
}
func (g *Glg) Logf(format string, val ...interface{}) error {
	return g.out(LOG, format, val...)
}
func ( g * Glg ) Logf ( format string , val ... interface { } ) error { return g . out ( LOG , format , val ... ) }
// Logf writes std log event with format
Logf writes std log event with format