Make cake a postinstall task + use forever for npm start

  * Prepublish task was not being picked up at deployment.

package.json

@@ -12,8 +12,8 @@
     "js"
   ],
   "scripts": {
-    "start": "node js/server.js",
-    "prepublish": "cake clean && cake build",
+    "start": "node_modules/forever/bin/forever -w js/server.js",
+    "postinstall": "cake clean && cake build",
     "test": "node_modules/.bin/mocha js/test/* --require should --reporter spec"
   },
   "dependencies": {