[Server] initial APNS node server with .gitignore

1. add package.json for installing the required node module
   apn module version 1.5.2 (2014.06.09)

   $ npm install

2. Node.gitignore
   https://github.com/github/gitignore/blob/master/Node.gitignore
[Server][APNS] implement push notification to all the devices token

1. copy the 'device token' from App with Xcode console,
   and add to device token array in 'push-notification.js'

   $ node push-notification.js

2. notification only shows up when the app is backgrounded or killed