feat[Breadcrumb]: add hide Breadcrumb option

src/components/Breadcrumb/index.vue

 <template>
   <el-breadcrumb class="app-breadcrumb" separator="/">
     <transition-group name="breadcrumb">
-      <el-breadcrumb-item v-for="(item,index) in levelList" v-if="item.meta.title" :key="item.path">
+      <el-breadcrumb-item v-for="(item,index) in levelList" v-if="item.meta.title&&item.meta.breadcrumb!==false" :key="item.path">
         <span v-if="item.redirect==='noredirect'||index==levelList.length-1" class="no-redirect">{{ item.meta.title }}</span>
         <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
       </el-breadcrumb-item>

src/router/index.js

@@ -18,7 +18,8 @@ import Layout from '../views/layout/Layout'
 * name:'router-name'             the name is used by <keep-alive> (must set!!!)
 * meta : {
     title: 'title'               the name show in submenu and breadcrumb (recommend set)
-    icon: 'svg-name'             the icon show in the sidebar,
+    icon: 'svg-name'             the icon show in the sidebar
+    breadcrumb: false            if false, the item will hidden in breadcrumb(default is true)
   }
 **/
 export const constantRouterMap = [