Add animated screenshots.

README.md

@@ -2,6 +2,8 @@
 ![logo](https://raw.github.com/gitlabhq/gitlabhq/master/public/gitlab_logo.png)
+![animated-screenshots](http://makeagif.com/media/6-23-2013/AN3Mo6.gif)
+
 ### GitLab allows you to
  * keep your code secure on your own server
  * manage repositories, users and access permissions