title: Parsley custom validator for if a select option is selected
body: <p>I have a select box with a few options, if someone selects other I want a text box to fade in and for it to be required, as far as getting it to show up I'm fine with that, the validator is where I'm having issues.</p>
  
  <p>Here is what I've tried so far, mostly based on the one example available.</p>
  
  <pre><code>conditionalvalue:
      fn: (value, requirements) -&gt;
          if requirements[1] == $(requirements[0]).val()
              return false
          true
  </code></pre>
  
  <p>On my field I have this</p>
  
  <pre><code>data-parsley-conditionalvalue='["[name=\"volunteer-check-in-new-name-title-select\"]", "other"]'
  </code></pre>
  
  <p>For reference here is what my select box looks like</p>
  
  <pre><code>&lt;select name="volunteer-check-in-new-name-title-select" data-bind="volunteer-new-final-title-field"&gt;
      &lt;option value="dr"&gt;Dr.&lt;/option&gt;
      &lt;option value="mr"&gt;Mr.&lt;/option&gt;
      &lt;option value="mrs"&gt;Mrs.&lt;/option&gt;
      &lt;option value="miss"&gt;Miss.&lt;/option&gt;
      &lt;option value="ms"&gt;Ms.&lt;/option&gt;
      &lt;option value="other"&gt;Other&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>I feel like it has something to do with not using the value part of the function? I wish there was more documentation on this.</p>