title: Open android app from PUSH notification
body: <p>Got a little problem that's been bugging me..</p>
  
  <p>I've set up my application to receive PUSH notifications from Urban Airship and that all works fine, but when I tap on a notification in the notifications center, nothing happens.</p>
  
  <p>I want my app to open when a user taps a PUSH notification - what can I do to achieve this?</p>
  
  <p>Any help is as always greatly appreciated.</p>
  
  <p>Thanks</p>