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

test/client/unit/specs/Hello.spec.js

@@ -0,0 +1,12 @@
+import Vue from 'vue';
+import Hello from 'src/components/Hello';
+
+describe('Hello.vue', () => {
+  it('should render correct contents', () => {
+    const vm = new Vue({
+      el: document.createElement('div'),
+      render: (h) => h(Hello),
+    });
+    expect(vm.$el.querySelector('.hello h1').textContent).to.equal('Hello Vue!');
+  });
+});