s3gof3r.go
func New(domain string, keys Keys) *S3 {
	if domain == "" {
		domain = DefaultDomain
	}
	return &S3{domain, keys}
}
func New(domain string, keys Keys) *S3 {
	if domain == "" {
		domain = DefaultDomain
	}
	return &S3{domain, keys}
}
// New Returns a new S3
// domain defaults to DefaultDomain if empty