added postinstall command to run in a cloud server

Author: Ferie

package.json

@@ -5,7 +5,8 @@
     "homepage": "http://www.riccardoandreatta.com/",
     "main": "index.html",
     "scripts": {
-        "start": "node server"
+        "start": "node server",
+        "postinstall": "gulp --type production"
     },
     "author": {
         "name": "Riccardo Andreatta"