title: Fineuploader limit to a single file
body: <p>I would like to limit the amount files that can be dropped in the bucket to just a single file. I discovered the validation directive and the itemLimit attribute. However, when I set that to 1, it really doesn't do anything. Here's the code that I use to create the instance of fine upload: </p>
  
  <p>Thanks for the help!</p>
  
  <pre><code>                $(this).fineUploader({
                      request: {
                          endpoint: 'api/endpoint.php'
                      },
                      validation: {
                          itemLimit: 1
                      },
                      autoUpload: true,
                      text: {
                          uploadButton: 'DROP ASSET HERE',
                      },
                      debug: false
                  })
                      .on('complete', function(event, id, fileName, response) {
  
                  });
  </code></pre>