title: slick carousel slickGoTo doesn't work
body: <p>I'm using the slick carousel class for a slider. 
  HTML:</p>
  
  <pre><code>&lt;div class="map"&gt;
    &lt;div&gt;
      &lt;div class="step"&gt;
        &lt;div class="m_left"&gt;&lt;a href="#" class="next-slide"&gt; nextPage&lt;/a&gt;&lt;/p&gt;
        &lt;/div&gt;
        &lt;div class="m_right"&gt;&lt;img src="/bindella/images/map_tsc.jpg"&gt;&lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
    &lt;div&gt;your content&lt;/div&gt;
    &lt;div&gt;your content&lt;/div&gt;
    &lt;div&gt;your content&lt;/div&gt;
  &lt;/div&gt;
  &lt;/div&gt;  
  </code></pre>
  
  <p>JS:</p>
  
  <pre><code>$(document).ready(function() {
    $('.map').slick({
      centerMode: true,
      adaptiveHeight: true
    });
  
    $('.next-slide').click(function() {
      $('.map').slickGoTo(1);
    });
  });     
  </code></pre>
  
  <p>The function <code>slickGoTo</code> doesn't work. What is wrong?</p>