标准化 Select 基本功能
改文件名。调整注释风格
Merge pull request #370 from Exodia/3.1.0-dev

标准化 Select 基本功能
Merge branch '3.1.0-dev' of https://github.com/ecomfe/esui into 3.1.0-dev

Conflicts:
	demo/assets/demo.css
	demo/classic/Button.html
	src/css/standard/main.less
fixed demo style.