Add a blink comparator and pixel difference to image diffs

Tom

2014-11-17 b6f47539cd1a1dafe05ffd6fdc40bce4547c479d

 src/main/java/com/gitblit/wicket/panels/GravatarImage.html

@@ -4,6 +4,6 @@
      xml:lang="en"  

      lang="en">

<wicket:panel>

<a href="#" wicket:id="link"><img wicket:id="image"></img></a>

<img wicket:id="image"></img>

</wicket:panel>

</html>