Question:Bootstrap的定义？有什么用？如何助力前端开发？
Answers：
它是一个在用HTML，CSS和javascript创建网站和网页应用的时候可以用到的基础内容。
- More information and links to download http://stackoverflow.com/tags/twitter-bootstrap/info
- getting started http://getbootstrap.com/getting-started/
- example http://bootsnipp.com/
- Themes http://bootswatch.com/
- Bootply - Bootstrap Editor and Builder http://www.bootply.com/
更新
官网的有一个明确的定义："Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web."
