add newline at the end
Merge pull request #1 from sofsirwj/base.css

顺序找了这么几篇文章，应该可以回答你的疑惑：
* http://stackoverflow.com/questions/5813311/no-newline-at-end-of-file
* https://github.com/yiisoft/yii2/issues/95
* https://github.com/editorconfig/editorconfig/wiki/Newline-at-End-of-File-Support