title: Dropzone.js uploads only two files when autoProcessQueue set to false
body: <p>I use <a href="http://www.dropzonejs.com" rel="noreferrer">Dropzone.js</a> and I want it to upload the dropped not automatically but when the user clicks a button. So I set the <code>autoProcessQueue</code> option to <code>false</code>. When the button is clicked the <code>processQueue()</code> method is called. I would suppose that now the full queue is processed. But thats not the case. Only the number of files which is specified in the <code>parallelUploads</code> option will be uploaded. The standard value of <code>parallelUploads</code> seems to be 2. Which every click 2 files are processed and uploaded.</p>
  
  <p>Do I have to set <code>parallelUploads</code> to an very high number, for now to solve this?</p>
  
  <p>Here's my full JS code:</p>
  
  <pre><code>var myDropzone = new Dropzone("div#myId", {
    url: "http://www.torrentplease.com/dropzone.php",
    addRemoveLinks: true,
    thumbnailWidth: "80",
    thumbnailHeight: "80",
    dictCancelUpload: "Cancel",
    autoProcessQueue: false
  });
  
  myDropzone.on("drop", function(event) {
    $('.edit_tooltip .option_bar').animate({
      opacity: 1,
      top: "-5"
    });
  });
  
  
  $('.edit_tooltip .option_bar .button').click(function() {
    myDropzone.processQueue();
  });
  </code></pre>