title: Failed: Cannot read property 'all' of undefined
body: <p>We have been using <code>protractor.promise.all([promise1, promise2, promise3])</code> extensively to resolve multiple promises up until the upgrade to <a href="https://github.com/angular/protractor/blob/master/CHANGELOG.md#400" rel="nofollow">Protractor 4.0.0</a>.</p>
  
  <p>Now, it is failing with:</p>
  
  <blockquote>
    <p>Failed: Cannot read property 'all' of undefined</p>
  </blockquote>
  
  <p>What should we use instead of <code>protractor.promise.all()</code>, or is this a bug?</p>