title: Flexslider startAt option and directionNav seem to conflict
body: <p>I am using Flexslider 2.0 with the startAt option on the last slide.</p>
  
  <p>This seems to mess up the directional navigation.</p>
  
  <p>Anybody had this issue before and knows how to solve it?</p>
  
  <p>The code I am using with nothing really special:</p>
  
  <pre><code>    $(".period-slides").flexslider({
        animation: "slide", 
        animationLoop: false,
        itemWidth: 265,
        minItems: 4,
        maxItems: 4,
        controlNav: false,
        directionNav: true,
        prevText: "\ue75d",
        nextText: "\ue75e"
        startAt: 7
      });
  </code></pre>
  
  <p>EDIT: Html added</p>
  
  <pre><code>&lt;div class="period-slides"&gt;
    &lt;ul class="slides"&gt;
      &lt;li class="slide"&gt;&lt;!-- repeated 8 times --&gt;
        &lt;div class="period-overview"&gt;
          &lt;p&gt;Some Content&lt;/p&gt;
        &lt;/div&gt;  
      &lt;/li&gt;
    &lt;/ul&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>EDIT: It doesn't seem to have a proper indication of at what position in currently is, seems like in the navigation the current position is the first slide. So I when setting the startAt it doesn't set the navigation properly.</p>