glg.go
func (g *Glg) CustomLog(level string, val ...interface{}) error {
	return g.out(g.TagStringToLevel(level), blankFormat(len(val)), val...)
}
func (g *Glg) CustomLog(level string, val ...interface{}) error {
	return g.out(g.TagStringToLevel(level), blankFormat(len(val)), val...)
}
// CustomLog outputs custom level log