title: Diff of current and previous version using vim-fugitive
body: <p>I know that <code>:Glog</code> will populate the quickfix list with all the versions of the file in the current buffer and that I can hit <code>&lt;enter&gt;</code> on these to see the file at that particular version, but is there an easy way to see the diff of a particular version with the previous version (to easily see what has changed)?</p>
  
  <p>EDIT: What I'm after is seeing each of these changes in a vertical diff in vim: <code>git log -p -- path/to/file.txt</code>.</p>