Commits, statuses, etc. after first page are not included in results

Steps to reproduce:

1. Find a commit with more than 30 statuses
2. Write a script which instantiates a repo object and calls `repo.listStatuses(sha)`, where `sha` is the commit from step 1
3. Look at the list of results

Actual:
- Only the first page of results is included
- Looking at `Repository.js`, only a single HTTP request is being made:

```
listStatuses(sha, cb) {
return this._request('GET', `/repos/${this.__fullname}/commits/${sha}/statuses`, null, cb);
}
```

Expected:
- All are included, or something is implemented like the discussion in https://github.com/github-tools/github/issues/406

从 Repository.js 和 listStatuses(sha) 入口点开始，然后查看 issue #406 中关于分页的讨论。使用包含超过 30 个状态的提交确认其行为，并确保结果包含所有状态，或遵循该讨论中达成一致的方法。

由索引模型根据 Issue 内容生成。