title: git: remove dead branch after a rebase?
body: <p>I have the following git branches: master and dev:</p>
  
  <pre><code>   *master*
        |
  A--B--C
     \--D--E
           |
         *dev*
  </code></pre>
  
  <p>After rebasing dev on master, I have:</p>
  
  <pre><code>   *master*
        |
  A--B--C--D'--E'
     \--D--E   |
               |
             *dev*
  </code></pre>
  
  <p>So D and E remain in a 'dead branch'. How can I remove them?</p>