title: Github for mac diff options
body: <p>Is there a way to configure <a href="http://mac.github.com/" rel="noreferrer">github for mac</a> to do a diff with the <code>-w</code> option to ignore whitespace?</p>
  
  <p>We are in the process of replacing all tabs with spaces in our project but when looking at the diffs for these commits in Github:mac the whole file is marked as changed which makes it hard to see the actual changes.</p>