Vue Project Setup (#8018)

* add files for new client side and reorg gulp tasks

* add deps and script for new client

* fix webpack paths so that building works

* fix static assets not copied into prod build

* fix linting

* add eslint deps and re-enable it in webpack

* add most missing deps for client side and split .babelrc for client

* reorganize .eslintignore

* update client tests paths and .gitignore

* uncomment code

* client: move App component

* client: update oaths in App component

* fix client tests and add more deps

* add client side tests to npm test

* fix typo in depencency name

* update more deps

* fix karma.conf.js and upgrade phantomjs

* fix dep and move karma.conf to subdirectory

* update karma.conf.js position in Gruntfile

* try downgrading phantomjs

* Fixup client tests (#8032)

* Use phantom 2

* fix(tests): Fix refresher test

* gitignore translation mock

* Update karma version

* disable e2e tests for new client from build

* write vue templates with pug

* add basic routing

* remove unnecessary Function.bind shim

* remove unused dependency

website/client/components/Hello.vue

@@ -0,0 +1,21 @@
+<template lang="pug">
+.hello
+  h1 {{ msg }}
+</template>
+
+<script>
+export default {
+  data () {
+    return {
+      msg: 'Hello Vue!',
+    };
+  },
+};
+</script>
+
+<!-- Add "scoped" attribute to limit CSS to this component only -->
+<style scoped>
+h1 {
+  color: #42b983;
+}
+</style>