func Print(args ...interface{}) {
	Logger.Print(args...)
}
Print writes a log entry.
It uses Logger if not nil, otherwise it uses the default log.Logger.
package log
import (
	"log"
	"os"
)
var Logger StdLogger = log.New(os.Stderr, "", log.LstdFlags)
type StdLogger interface {
	Fatal(args ...interface{})
	Fatalln(args ...interface{})
	Fatalf(format string, args ...interface{})
	Print(args ...interface{})
	Println(args ...interface{})
	Printf(format string, args ...interface{})
}
func Fatal(args ...interface{}) {
	Logger.Fatal(args...)
}
func Fatalf(format string, args ...interface{}) {
	Logger.Fatalf(format, args...)
}