Element option not working when target id isn't a direct child of element

[HugoPoi]

When using element option and the target id isn't a direct child of element.

<div class="container-with-scroll">
  <h2 id="working-target"></h2>
  <a><img id="target"></a>
</div>

  // This working great :
  $('#working-target').animatescroll({ element: '.container-with-scroll', padding: 20 });
  // This not working :
  $('#target').animatescroll({ element: '.container-with-scroll', padding: 20 });

Problem is here https://github.com/ramswaroop/animatescroll.js/blob/master/animatescroll.js#L162
The use of this.parent() causing the issue because the parent of target is <a> not the .container-with-scroll.

The fix:

  $(opts.element).stop().animate({ scrollTop: this.offset().top - $(opts.element).offset().top + $(opts.element).scrollTop() - opts.padding}, opts.scrollSpeed, opts.easing);

I can do a PR if needed.