title: Number of commits in a git repository
body: <p>A 5 month project of mine is nearing its end and as a fan of pointless statistics,<br>
  I'd like to know how many commits have been made since the repository's inception.</p>
  
  <p>How do I find that out?</p>
  
  <p>Notes:</p>
  
  <ol>
  <li><p>I know there is no <em>one</em> repository, I'm just interested in the local version.</p></li>
  <li><p>This is trivial in subversion, as the revision identifier 
  seems to be the commit number.</p></li>
  </ol>