Fixed auth url error

- Fixed auth url error, request params has prescribed sequence
- Set `snsapi_userinfo` as default scope
- Fixed `snsapi_base` scope data

WeChat OAuth Documention:

http://mp.weixin.qq.com/wiki/index.php?title=%E7%BD%91%E9%A1%B5%E6%8E%88%E6%9D%83%E8%8E%B7%E5%8F%96%E7%94%A8%E6%88%B7%E5%9F%BA%E6%9C%AC%E4%BF%A1%E6%81%AF