default installed babel-plugin-component will conflict with babel-plugin-import when implement on-demands import

[kid1412621]

after set up on-demands import, then type app.use(ElComponent1) and app.use(ElComponent2). when using sass, only ElComponent1 got style.

[kid1412621]

I think it should change to babel-plugin-import 'coz this plugin is still maintaining, and keep sync with official doc.