title: Adding an extra remote repository in EGit
body: <p>I have 3 different git repositories:</p>
  
  <ol>
  <li>An open source project</li>
  <li>My own fork of the project on GitHub, which was forked from 1.</li>
  <li>My local repository, which was cloned from 2.</li>
  </ol>
  
  <p>I work on 3., and can push/pull changes to/from 2.</p>
  
  <p>However, there are now changes in 1. which I would also like to merge into my own fork. I think what I want to do is pull the changes from 1. into a remote tracking branch in 3., do the merge locally, then push out to 2...... is that sensible?</p>
  
  <p>If so, how do I best achieve this in EGit? In particular I'm not sure how I should get Egit to pull in the changes from 1. when it is already configured to push/pull from 2.</p>