title: td tag with expander class in Zurb Ink is necessary?
body: <p>Is it necessary to add a <strong>td</strong> tag with class <strong>expander</strong> inside every table containing one or more <strong>td</strong> tags? I had a issue with sub-grid which I posted <a href="https://stackoverflow.com/questions/33412609/subgrid-nested-under-column-with-offset-is-not-working">here</a>. I solved it by adding </p>
  
  <pre><code>&lt;td class="expander"&gt;&lt;/td&gt;
  </code></pre>
  
  <p>after the last the <strong>td</strong> tag using <strong>sub-columns</strong> and it did solve the problem. Also, the Ink documentation doesn't explicitly specify whether to to add the expander.</p>