title: how to tell gradle to download all the source jars
body: <p>Ideally, we would like to add a task for downloading all the source jars for the first level and transitive dependencies of our project.  Is there a way to do that?  </p>
  
  <p>If not, is there a command line option to supply like maven has to get all the sources downloaded onto our machines?</p>
  
  <p>It seems like that should just be the default these days at least for first level dependencies as it gives you the javadoc in eclipse then which is very nice when doing the code completion stuff.</p>