title: jQuery tablesorter - rowspan in headers causes odd behavior
body: <p><strong>Example of failure:</strong><br>
  <a href="http://progamonth.com/files/testfile.html" rel="nofollow noreferrer">http://progamonth.com/files/testfile.html</a></p>
  
  <p><strong>Desired Behavior:</strong><br>
  Ideally, any headers with a <code>colspan</code> shouldn't affect sorting. Right now, they receive sorting buttons, and even if I specify <code>headers: {index: {sorter: false}}</code> for each of the colspan headers, they still affect sorting. When I click the headers with no rowspan or colspan (1.1.2 etc), they seem to be causing sorting to occur 4 columns to the right!</p>
  
  <p><strong>Example of this working, that I cannot reproduce:</strong><br>
  <a href="http://lovepeacenukes.com/tablesorter/2.0/docs/" rel="nofollow noreferrer">http://lovepeacenukes.com/tablesorter/2.0/docs/</a></p>
  
  <p>This page seems to show this behavior working, but I just can't reproduce this. The example for rowspan doesn't even manually turn those headers off, so what's going on?! I do see that the colspan headers in the example have no <code>header</code> class, but that seems to be being applied by the tablesorter plugin.</p>
  
  <p>Does anyone know what's going on?</p>
  
  <p><strong>Working picture:</strong>
  <a href="http://progamonth.com/files/working.png" rel="nofollow noreferrer">alt text http://progamonth.com/files/working.png</a></p>
  
  <p><strong>Not working picture:</strong>
  <a href="http://progamonth.com/files/notworking.png" rel="nofollow noreferrer">alt text http://progamonth.com/files/notworking.png</a></p>