It defaults the logger to the stdlib log implementation.
if LOG_TO_FILE is true ,it supoorts file log.
Set the logger level , flags...
import "github.com/XXX/simple-go-log"
// SetLogger expects github.com/go-log/log.Logger interface
log.SetLogger(mylogger)
log.SetLevel(...)
log.SetFlags(...)
// Set log file path
log.SetPath(...)