title: Can't get bxSlider PreloadImages=visible working
body: <p>I'm currently working with bxSlider and I'm trying to get the preLoadImages=visible functionality working. According to the website this should be on by default, but it seems like it's not doing anything.</p>
  
  <p>My code is pretty basic:</p>
  
  <pre><code>    $('.bxslider').bxSlider({
          auto: true,
          preloadImages: 'visible'
      });
  </code></pre>
  
  <p>Yet it seems every time all the images are loaded at the same time. Is there something I'm missing here?</p>
  
  <p>Thanks in advance.</p>