First set of upgrade to 5.3 stuff.

gulpfile.js

@@ -0,0 +1,19 @@
+const elixir = require('laravel-elixir');
+
+require('laravel-elixir-vue');
+
+/*
+ |--------------------------------------------------------------------------
+ | Elixir Asset Management
+ |--------------------------------------------------------------------------
+ |
+ | Elixir provides a clean, fluent API for defining some basic Gulp tasks
+ | for your Laravel application. By default, we are compiling the Sass
+ | file for our application, as well as publishing vendor resources.
+ |
+ */
+
+elixir(mix => {
+    mix.sass('app.scss')
+       .webpack('app.js');
+});