title: Github shows name instead of a linked username in commits
body: <p>I just helped a friend to set up a Github account to collaborate on my project. His commits come through, but for some reason on the "Source" page of my repository next to his commit is only his name and not his username (with a link).</p>
  
  <p>It seems strange, since Github obviously recognizes him (I added him to the list of collaborators etc.</p>
  
  <p>Seems like a stupid question, but Google couldn't help.</p>
  
  <p>Thanks!</p>