title: Jquery tablesorter - Hyphen bug
body: <p>I made a very basic example, and when I use a hyphen on the first <code>&lt;tr&gt; &lt;td&gt;</code> (first row, first cell), tablesorter no longer works.<br>
  I'm using <code>jquery 1.7.1</code>, and latest <code>tablesorter.min.js</code></p>
  
  <p>Code examples:</p>
  
  <p><strong>Works -> No hyphen:</strong> <a href="http://jsfiddle.net/6gjLs/4/" rel="nofollow">http://jsfiddle.net/6gjLs/4/</a> <br/>
  <strong>Works -> Hyphen on second row</strong>: <a href="http://jsfiddle.net/8Wet2/4/" rel="nofollow">http://jsfiddle.net/8Wet2/4/</a><br/>
  <strong>Not working -> Hyphen on first td on first row:</strong> <a href="http://jsfiddle.net/YkaCv/4/" rel="nofollow">http://jsfiddle.net/YkaCv/4/</a></p>
  
  <p>The code as you can see is exactly the same on the 3 examples, only the table data changes. </p>
  
  <p>Anyone experienced the same problem? Any workaround?</p>