Bump version to v0.5.0.

New features include:
 - New function `reSort()` for forcing the Collection to re-sort itself

Author: jrbarron

qpm.json

@@ -10,7 +10,7 @@
     "url": "https://github.com/Cutehacks/gel.git"
   },
   "version": {
-    "label": "0.4.0"
+    "label": "0.5.0"
   },
   "dependencies": [
   ],