title: How can I make my plugin automatically install third party features?
body: <p>I am developing an eclipse feature that has a dependency on Acceleo. When I install my feature using its update site I get an error because it cannot find plugins related to Acceleo.</p>
  
  <p>My feature manifest declares dependant plugins and features.</p>
  
  <p>My feature installs fine if the user adds the Acceleo update site before installing my feature or installs Acceleo before installing my feature but I would like this  to happen automatically. </p>
  
  <p>Is this even possible?</p>
  
  <p>Hope that makes sense and thanks in advance.</p>