Setup TravisCI

It might be a good idea to test using Blink (so that we can confirm that widgets actually show up and are interact-with-able). We do something similar with WebIO (though sometimes setting up Blink is a pain in a CI environment).

首先定位仓库中现有的 WebIO 测试设置以及任何 TravisCI 配置。确定如何在 CI 中运行 Blink，然后验证 CI 作业能够确认小部件已显示且可交互，同时不会引入特定于环境的失败。

由索引模型根据 Issue 内容生成。