update version

上次没更新版本号~ 亲

修复slideTo时丢class的bug，webpack打包中移除插件

添加webpack打包输出

fix perspective compatibility

修复rotate等动画下跳页错误

Merge pull request #378 from be-fe/2.X

2.1.8

Merge pull request #364 from xieyu33333/master

remove extra _unWatchTransitionEnd

Merge pull request #360 from be-fe/2.X

2.1.6

Merge pull request #352 from be-fe/2.X

2.1.5