Default Gulpfile example to Sass

Gulpfile.js

@@ -12,7 +12,7 @@ var elixir = require('./vendor/laravel/elixir/Elixir');
  */
 
 elixir(function(mix) {
-    mix.less("bootstrap.less")
+    mix.sass("bootstrap.scss")
        .routes()
        .events()
        .phpUnit();