title: What does the `priority` parameter do to GCM Messages?
body: <p>Google recently introduced the parameter <code>priority</code> in their <a href="https://developers.google.com/cloud-messaging/server-ref#table1" rel="nofollow">documentation of GCM</a>. The documentation reads:</p>
  
  <blockquote>
    <p>Sets the priority of the message. Use values between 0 - 10, where the higher value represents higher priority.</p>
  </blockquote>
  
  <p>But what does this priority actually mean? What do the different values, 0 - 10, indicate?</p>