title: can't receive push notification in windows 10 universal app
body: <p>I'm trying to migrate windows 8.1 store app project to windows 10 universal app project.
  However the win10 app can't receive any push notification while the win8.1 app works fine.
  The only difference between two project is the package.appxmanifest.</p>
  
  <p>Is there any setting or code need to add on win10 project for receiving push notification?
  Can win10 universal app use windows push notification service currently?</p>