[preview] Fix $ref broken in preview

Fixes #627

Author: mohsen1

bower.json

@@ -48,7 +48,7 @@
     }
   },
   "devDependencies": {
-    "sway-worker": "~1.3.0",
+    "sway-worker": "~1.5.0",
     "angular-mocks": "~1.4.2"
   }
 }