title: Coloring white space in git-diff's output
body: <p>Regarding code formatting I'm kind of purist :). I very often remove unnecessary white spaces (lines with only ws, ws at the end of lines etc). I even have set vim to show that kind of lines colored to red.</p>
  
  <p>My problem is that using git-diff I often see something like this:</p>
  
  <pre><code>-      else{ 
  +      else{
  </code></pre>
  
  <p>Even if I have git-diff colored I can't see difference (in that particular situation I removed 1 ws at the end of line). Is there any way to tell git-diff to show that ws colored to red? (for example those matched with /\s+$/ regexp).</p>