title: Customize error message and placement
body: <p>Currently the <a href="https://github.com/Knockout-Contrib/Knockout-Validation" rel="nofollow noreferrer">Knockout-Validation</a> plugin automatically add this HTML element to my web page:</p>
  
  <pre><code>&lt;span class="validationMessage"&gt;This field is required.&lt;/span&gt;
  </code></pre>
  
  <ol>
  <li>I want to change the "This field is required." text.</li>
  <li>I want to change the placement of the <code>&lt;span&gt;</code> HTML element.</li>
  <li>I want to add a CSS class (<code>.err</code>, specifically) to my textbox so that I can add a red border.</li>
  </ol>
  
  <p>How can that be done with Knockout-Validation?</p>