\Gini\Gapper\Client基本实现

![screen shot 2014-06-18 at 17 55 27](https://cloud.githubusercontent.com/assets/3204734/3312289/b431bfd6-f6cf-11e3-86a1-23ab004f1e0c.png)

![screen shot 2014-06-18 at 18 03 24](https://cloud.githubusercontent.com/assets/3204734/3312297/d5bf2800-f6cf-11e3-951d-00c753d8f399.png)

为啥我们特地要增加一个->username属性呢?