[new feature] add i18n support (#310)

* fix: Tabbar icon line-height

* [new feature] progress add showPivot prop

* [new feature] TabItem support vue-router

* [new feature] update document header style

* [Doc] add toast english ducoment

* [new feature] add i18n support

* feat: Extract demos from markdown

* feat: Base components demos

* [new feature] complete demo extract & translate

* [fix] text cases

* fix: add deepAssign test cases

* fix: changelog detail

* [new feature] AddressEdit support i18n

docs/demos/views/icon.vue

@@ -0,0 +1,137 @@
+<template>
+  <demo-section>
+    <demo-block :title="$t('title')">
+      <van-col span="8" v-for="icon in icons" :key="icon">
+        <van-icon :name="icon"></van-icon>
+        <span>{{ icon }}</span>
+      </van-col>
+    </demo-block>
+  </demo-section>
+</template>
+
+<script>
+const icons = [
+  'close',
+  'location',
+  'clock',
+  'gold-coin',
+  'chat',
+  'exchange',
+  'upgrade',
+  'edit',
+  'contact',
+  'passed',
+  'points',
+  'delete',
+  'records',
+  'logistics',
+  'check',
+  'checked',
+  'gift',
+  'like-o',
+  'like',
+  'qr',
+  'qr-invalid',
+  'shop',
+  'photograph',
+  'add',
+  'add2',
+  'photo',
+  'cart',
+  'arrow',
+  'search',
+  'clear',
+  'success',
+  'fail',
+  'wechat',
+  'alipay',
+  'password-view',
+  'wap-nav',
+  'password-not-view',
+  'wap-home',
+  'ecard-pay',
+  'balance-pay',
+  'peer-pay',
+  'credit-pay',
+  'debit-pay',
+  'other-pay',
+  'shopping-cart',
+  'browsing-history',
+  'goods-collect',
+  'shop-collect',
+  'receive-gift',
+  'send-gift',
+  'setting',
+  'coupon',
+  'free-postage',
+  'discount',
+  'birthday-privilege',
+  'member-day-privilege',
+  'balance-details',
+  'cash-back-record',
+  'points-mall',
+  'exchange-record',
+  'pending-payment',
+  'pending-orders',
+  'pending-deliver',
+  'pending-evaluate',
+  'cash-on-deliver',
+  'gift-card-pay',
+  'underway',
+  'point-gift',
+  'after-sale',
+  'edit-data',
+  'question',
+  'description',
+  'card',
+  'gift-card',
+  'coupon',
+  'completed',
+  'value-card',
+  'certificate',
+  'tosend',
+  'sign',
+  'home',
+  'phone'
+];
+
+export default {
+  i18n: {
+    'zh-CN': {
+      title: '图标列表'
+    },
+    'en-US': {
+      title: 'Icon List'
+    }
+  },
+
+  data() {
+    this.icons = icons;
+    return {};
+  }
+}
+</script>
+
+<style lang="postcss">
+.demo-icon {
+  font-size: 0;
+
+  .van-col {
+    text-align: center;
+    height: 100px;
+    float: none;
+    display: inline-block;
+  }
+
+  .van-icon {
+    display: block;
+    font-size: 32px;
+    margin: 15px 0;
+    color: rgba(69, 90, 100, .8);
+  }
+
+  span {
+    font-size: 14px;
+  }
+} 
+</style>