title: Push notifications not working properly when the app is not active (killed)
body: <p>I'm facing a problem with push notifications, I'm using Google Cloud Messaging,</p>
  
  <p>My problem is that my app works with some cached data, and I refresh that cache with the data coming from push notificacions, so when the app is killed by the user (home button + swipe-up) and the app receive a push notification it doesn't call the method <code>didReceiveRemoteNotification</code>, so the app can't access to the payload of that notification and update the cached data.</p>
  
  <p>So, is there a way to achieve this? </p>
  
  <p>Only when the user taps the notifications and the app gets it through the <code>application:didFinishLaunchingWithOptions</code> method? </p>
  
  <p>If the user opens the app by clicking the application icon I can't get the notificaton's payload?</p>
  
  <p>PD: If the app is in foreground or background (not killed) it works perfectly</p>