title: removing all manually added files from Dropzone.js?
body: <p>There is a unknown problem while programmatically deleting programmatically added files to Dropzone.
  Here is my code that is not working:</p>
  
  <pre><code>// constructor - OK
  docsDropzone = new Dropzone( "#docsUpload", {
      url: uploadUrl,
      addRemoveLinks: true,
      init: function() {
          this.on( 'removedfile', removedFileCallback );
      }
  } );
  
  // add file - OK
  var mockFile = { name: 'test.jpg', size: 0 };
  docsDropzone.emit( "addedfile", mockFile );
  docsDropzone.emit( "thumbnail", mockFile, 'test.jpg' );
  
  // remove files - NOT OK
  docsDropzone.removeAllFiles( true );
  </code></pre>