title: Get value of HTML select option using its index with jQuery
body: <p>HTML for select and options:</p>
  
  <pre><code>&lt;select class="dropdown"&gt;
      &lt;option value="one"&gt;One&lt;/option&gt;
      &lt;option value="two"&gt;Two&lt;/option&gt;
      &lt;option value="three"&gt;Three&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>I want the value of the option at index 1, something along the lines of</p>
  
  <pre><code>$('.dropdown[1]').value
  // should return 'two'
  </code></pre>