Bump to version v0.4.0.

New features include:
- Ability to get an object by 'id'
- Attached properties

Author: jrbarron

qpm.json

@@ -10,7 +10,7 @@
     "url": "https://github.com/Cutehacks/gel.git"
   },
   "version": {
-    "label": "0.3.2"
+    "label": "0.4.0"
   },
   "dependencies": [
   ],