title: Magit: how to do an octopus merge?
body: <p>I've been working with magit for a few months, and I'm gradually coming to use it to do more and more git actions, but I still haven't figured out how use magit to do an octopus merge. In these cases I still need to open the shell and write out the merge command explicitly, e.g.</p>
  
  <pre><code>git merge branchA branchB
  </code></pre>
  
  <p>when I'm checked out on <code>master</code>.</p>
  
  <p>How do I specify multiple heads for the merge commit?</p>