Docs: add English language support (#170)

* feat: support lang entry build

* feat: vant support lang switch

* move lang iframe-router to utils & fix router link bug

* add en-US config && add some translation

* chang async. to async_ (support superman cdn)

* add layout translation

* change nav style

* upgrade zan-doc

* fix: doc config

* upgrade zan-doc && remove useless code

* fix changelog generate path

package.json

@@ -20,7 +20,7 @@
     "build:style-entry": "VUE_ENV=server node build/bin/build-style-entry.js",
     "build:changelog": "sh build/build-changelog.sh",
     "deploy": "npm run deploy:docs && npm run deploy:cdn && gh-pages -d docs/dist --remote youzan && rimraf docs/dist",
-    "deploy:cdn": "superman cdn /zanui/vue docs/dist/*.js docs/dist/*.css",
+    "deploy:cdn": "superman cdn /zanui/vue docs/dist/*.js docs/dist/*.css && superman cdn /zanui/vue/async_en-US docs/dist/async_en-US/*.js && superman cdn /zanui/vue/async_zh-CN docs/dist/async_zh-CN/*.js",
     "deploy:docs": "rimraf docs/dist && cross-env NODE_ENV=production webpack --progress --hide-modules --config  build/webpack.config.prod.js",
     "dist": "node build/bin/build-lib.js",
     "clean": "rimraf lib && rimraf packages/*/lib",
@@ -119,6 +119,6 @@
     "webpack-bundle-analyzer": "^2.9.0",
     "webpack-dev-server": "^2.7.1",
     "webpack-merge": "^4.1.0",
-    "zan-doc": "0.2.17"
+    "zan-doc": "0.3.1"
   }
 }