[Improvement] Switch: support custom size (#723)

docs/demos/views/address-edit.vue

@@ -26,7 +26,7 @@ export default {
         name: '黄龙万科中心',
         address: '杭州市西湖区'
       }, {
-        name: '黄龙万科中心H座'
+        name: '黄龙万科中心G座'
       }, {
         name: '黄龙万科中心H座',
         address: '杭州市西湖区'
@@ -34,12 +34,12 @@ export default {
     },
     'en-US': {
       searchResult: [{
-        name: 'Name',
+        name: 'Name1',
         address: 'Address'
       }, {
-        name: 'Name'
+        name: 'Name2'
       }, {
-        name: 'Name',
+        name: 'Name3',
         address: 'Address'
       }]
     }

docs/demos/views/switch.vue

@@ -13,7 +13,7 @@
     </demo-block>
 
     <demo-block :title="$t('advancedUsage')">
-      <van-switch :value="checked2" @input="onInput" />
+      <van-switch :value="checked2" size="36px" @input="onInput" />
     </demo-block>
   </demo-section>
 </template>