title: Where does "data-toggle" attribute of bootstrap framework come from?
body: <p>I am trying to use some of the jQuery plugins for the <a href="http://twitter.github.com/bootstrap/javascript.html" rel="noreferrer">Bootstrap framework</a> and they use an attribute named "data-toggle".  I am getting the warning "attribute data toggle is not a valid atribute of a".  </p>
  
  <p>Where does data-toggle come form?</p>