[new feature] Swipe add 'initialSwipe' prop (#279)

* [bugfix] CouponList always show empty info

* [bugfix] add click feedback of buttons in components

* [Doc] add custom theme document

* [new feature] Notice bar support more props

* [bugfix] PullRefresh test cases

* [bugfix] unused NoticeBar style

* [bugfix] Swipe width calc error

* [Doc] english document of all action components

* [Doc] change document site path to /zanui/vant

* [Doc] fix

* [bugfix] uploader style error

* [bugfix] tabs document demo

* [new feature] Cell support vue-router target route

* [bugfix] add cell test cases

* update yarn.lock

* [bugfix] Tabbar cann't display info when use icon slot

* [Doc] update document title

* [bugfix] Dialog should reset button text when showed

* [new feature] CouponList add showCloseButton prop

* [new feature] Swipe add 'initialSwipe' prop

docs/examples-docs/en-US/swipe.md

@@ -72,6 +72,7 @@ export default {
 | autoplay | Autoplay interval (ms) | `Number` | - | - |
 | duration | Animation duration (ms) | `Number` | `500` | - |
 | showIndicators | Whether to show indocators | `Boolean` | `true` | - |
+| initialSwipe | Index of initial swipe, start from 0 | `Number` | `0` | - |
 
 ### Event