Fixes bug introduced in #203

Needs to import the library when using webpack.mix.js.
Will also be the case for future libraries.

public/mix-manifest.json

@@ -1,4 +1,4 @@
 {
-    "/js/app.js": "/js/app.js?id=d7ae290137b7fd06f300",
+    "/js/app.js": "/js/app.js?id=58b8bcf2d5c2eee74c51",
     "/css/app.css": "/css/app.css?id=e405a67622368f195d1b"
 }

resources/assets/js/app.js

@@ -1,3 +1,6 @@
+import Huebee from 'huebee';
+window.Huebee = Huebee;
+
 $.when( $.ready ).then(function() {
 
     if($('.message-container').length) {