支持SSR、升级Vue版本和增加新的icon (#40)

* search component add new style

* update vue version and support ssr

* unit test

* add new icon

* new icon

packages/actionsheet/src/actionsheet.vue

@@ -8,7 +8,8 @@
       <template v-if="!title">
         <ul class="van-actionsheet__list">
           <li
-            v-for="item in actions"
+            v-for="(item, index) in actions"
+            :key="index"
             class="van-actionsheet__item"
             :class="[item.className, item.loading ? 'van-actionsheet__item--loading' : '']"
             @click.stop="handleItemClick(item)">