Add manifestVersion

wordpress.app

@@ -1,7 +1,10 @@
 {
-  "version": "0.0.7",
-  "dockerImage": "girish/wordpress:0.6",
-  "healthCheckPath": "/",
-  "httpPort": "80",
-  "addons": [ "mysql" ]
-}
+    "version": "0.0.7",
+    "dockerImage": "girish/wordpress:0.6",
+    "healthCheckPath": "/",
+    "httpPort": "80",
+    "addons": [
+        "mysql"
+    ],
+    "manifestVersion": 1
+}