Updated version number to 2.2.5

Author: stefangabos

composer.json

@@ -17,7 +17,7 @@
         "php": ">=4.4.9",
         "mysql": ">=4.1.22"
     },
-    "version": "2.2.4",
+    "version": "2.2.5",
     "autoload": {
         "psr-0": { "Zebra_Mptt": "" }
     }