httpPort is now int

CloudronManifest.json

@@ -2,7 +2,7 @@
   "version": "0.0.8",
   "dockerImage": "girish/wordpress:0.6",
   "healthCheckPath": "/",
-  "httpPort": "80",
+  "httpPort": 80,
   "addons": [
     "mysql"
   ],