def expiring_url(object_key, temp_url_key, expires_at = Time.now.to_i + 60)
      temp_url(object_key, temp_url_key, expires_at)
    end
def expiring_url(object_key, temp_url_key, expires_at = Time.now.to_i + 60)
      temp_url(object_key, temp_url_key, expires_at)
    end
DEPRECATED: use temp_url instead, this will be removed in version 1.0