Releases for China UnionPay

move the code from https://github.com/terryzwt/commerce_unionpay to drupal.org.
this module has been used in several site.
Now it support direct pay only. If you need more payment method based on unionpay, welcome to contribute to this module.

代码从github.com迁移到这里。
这么模块已经有些网站在使用了。
目前该模块仅支持快捷支付。如果你需要更多的银联支付方法，欢迎贡献代码。