title: Nested tabs display in bootstrap 3
body: <p>I'm trying to include several tabs into an existing tab, it works but I have a display problem when I try to display the tab containing the nested tabs.
  When I click on it, the content of all the children tabs are displayed instead of the first tab only.
  Here is a link to check the problem:
  <a href="http://www.bootply.com/3hWg0EDCmx" rel="nofollow">http://www.bootply.com/3hWg0EDCmx</a></p>
  
  <p>I can't find where I'm wrong.</p>
  
  <p>Thanks</p>