This will fix the Webpack hot-reload `"Root or manually mounted instance modified. Full reload required."` warning that gets thrown when you update `App.vue`.

- Use vue-server-renderer 2.2.0 + vue-ssr-webpack-plugin to handle Webpack
  code-split bundle

- Use vue-router 2.2.0 to handle async components and async route hooks

- Use vue-loader 10.2.0 + vue-style-loader 2.0 for inline critical CSS +
  better style split

- Use vue-srr-html-stream to simplify streaming usage.

This reverts commit b04ea0c4.