title: Git removing commiter information
body: <p>I started some project on github.com. And I'm working on two machines. I did something like this:</p>
  
  <ol>
  <li>Create project on github,</li>
  <li>Clone project form github on Machine1,</li>
  <li>Did some commits on Machine1,</li>
  <li>Created reposytory on Machine2,</li>
  <li>Push changes from Machine1 to Machine2 and github.</li>
  </ol>
  
  <p>Next day I was working on Machine2. I have different configs there so I was doing commits with  "--author=something" param. After finishing work I pushed my changes to Machine1.</p>
  
  <p>I pushed my changes from Machine1 to github. And I can see that commits done on Machine1 have in history filed Author which is correct and also Committer filed which is from Machine1. And I don't want to public this Commiter filed. How I can remove it?</p>
  
  <p>Temporarily I did on Machine1:</p>
  
  <pre><code>git reset --hard &lt;commit before changes on Machine1&gt;
  git push -f github master
  </code></pre>
  
  <p>But it looks like that getting committer information is still possible. How to remove it permanently. </p>
  
  <p>Best regards,</p>
  
  <p>Adam</p>