title: Semantic UI Form Validation "depends" option not working
body: <p>As of <a href="http://semantic-ui.com/introduction/new.html#dependent-form-validation" rel="nofollow">version 2.2</a> form validations support a depending field. However when I try to implement it in my project, it seems that the <code>depends</code> option is completely ignored:</p>
  
  <pre><code>// HTML
  &lt;form class="ui form segment"&gt;
    &lt;input type="checkbox" name="is_volunteer" id="is_volunteer" /&gt;
    &lt;input type="text" name="volunteer_name" id="volunteer_name" /&gt;
  &lt;/form&gt;
  
  // JS
  $('form').form({
    inline: true,
    fields: {
      name: {
        identifier: 'volunteer_name',
        depends: 'is_volunteer',
        rules: [{ type: 'empty' }]
      }
    }
  })
  </code></pre>
  
  <p>It's basically the same structure as the shown demo. However, with this the <code>name</code> text field always gets validated, no matter if the checkbox is checked or not.</p>
  
  <p>Of course, I tried it also with proper semantic markup, but it's the same result.</p>
  
  <p>I also checked if I'm really using version 2.2, and I am... I also get no debug error or anything else.</p>