Update Select placeholder color from 999 to ccc

#204

ActionSheet align style format

* chore: add git commit hooks

* chore(package): add cz-conventional-changelog

add adapter cz-conventional-changelog for commitizen

listenScroll to scroll-events

* [update] scroll example, split old scroll to two pages

* [add]{heizontal.vue} heizontal scroll demo

* [add] fake jd home page scroll example

* [add] fake toutiao scroll example

* [fix] replace cube-view translate3d to translate

* [doc] toast

* [doc] remove multiple space

* [feat] add more icons