title: One server sending push notifications to Android and iOS devices
body: <p>Our organization has an Android app and an iOS app.</p>
  
  <p>We want to start pushing notification to these apps.</p>
  
  <p>Android has GCM.
  Apple has APNS. </p>
  
  <p>But we want to create an API which will work on both android and iOS.</p>
  
  <p>What is the easiest way to setup a server so that when a push notification needs to be sent, it knows exactly which server to send the message to?</p>