title: Github invalid author email commits, no contribution activity
body: <p>Recently, I did some commits without config user.email. Is there any way to edit those commits to be recognized as contribution on my GitHub profile. (there're no commit email - to add to as GitHub account - as you can see in the log bellow)</p>
  
  <p>Here some recent commit from git log command:</p>
  
  <p>(the last/first one with email is commited after I config user.email)</p>
  
  <pre><code>commit 4ae6cc5c00e380c70072f9647b29dc242d2682d1
  Author: Tin Nguyen &lt;my-Gmail@gmail.com&gt;
  Date:   Thu Sep 22 11:00:30 2016 +0700
  
      delete some unnecessary code
  
  commit 275362c077bb0495318d37b965c90beba2cb79b3
  Author: Tin Nguyen &lt;Tin Nguyen&gt;
  Date:   Wed Sep 21 07:41:51 2016 +0700
  
      modify database rules
  
  commit c6b3af19c24627cafd862eff7449bc5d3f95cfbc
  Author: Tin Nguyen &lt;Tin Nguyen&gt;
  Date:   Sun Sep 18 14:14:23 2016 +0700
  ...
  </code></pre>