verify_credentials接口参数错误

```
verify_credentials: function (user, callback)
```

参数user的结构必须为：
    user =  { blogtype : 'weibo', accesstoekn: 31y979,  uid: 123131231}
或者
    user =  { blogtype : 'weibo', accesstoekn: 31y979,  id: 123131231}
文档有误
