Vuex (#8041)

* add vuex, cleanup client directory and create example components

* disale sample unit test

* disable import for non existing file

* correct regexp for unit tests, add simple test to avoid error, add babel-polyfill for Vuex

* add line wrongly removed, update regexp

website/client/components/app.vue

@@ -0,0 +1,30 @@
+<template lang="pug">
+#app
+  site-header
+  ul
+    li
+      router-link(to='/') Home
+    li
+      router-link(to='/page') Another Page
+  router-view.view
+</template>
+
+<script>
+import SiteHeader from './siteHeader';
+
+export default {
+  components: {
+    SiteHeader,
+  },
+};
+</script>
+
+<style>
+#app {
+  margin: 0 auto;
+  width: 80%;
+  border-left : 1px solid;
+  border-right: 1px solid;
+  padding: 20px;
+}
+</style>