title: Sending push notifications to all users
body: <p>This may be a silly question, but I cannot find a way to send push notifications to all users with Parse.com. I can send notifications to specific channels though.</p>
  
  <p>I tried with</p>
  
  <pre><code>channels: []
  </code></pre>
  
  <p>but this yields an error.</p>
  
  <p>What's the exact JSON to send push notifications to <em>all</em> users? I'm using the REST API.</p>