title: how can fetch all emails
body: <p>I use contextio for fetch all email of my account but I haven't fetch any email </p>
  
  <p>this is code:</p>
  
  <pre><code>$args = array('label' =&gt; 'Primary','folder' =&gt; 'Inbox');
      $r = $contextio-&gt;listMessages('5a7364c56d5d992d945d54c3', $args);
      if ($r !== false) {
          foreach ($r-&gt;getData() as $message) {
              echo "Subject: ".$message['subject']."&lt;br&gt;";
          }
      } else {
          var_dump($r);
      }
  </code></pre>
  
  <p>output is false (in case else)</p>