adding image back to travis tag in readme

Author: garysweaver

README.rdoc

@@ -4,7 +4,7 @@ Active Admin is a framework for creating administration style interfaces. It
 abstracts common business application patterns to make it simple for developers
 to implement beautiful and elegant interfaces with very little effort.
 
-{<img src="https://secure.travis-ci.org/gregbell/active_admin.png?branch=master" />}[http://travis-ci.org/gregbell/active_admin] {<img src="https://codeclimate.com/badge.png" />}[https://codeclimate.com/github/gregbell/active_admin]
+{<img src="https://secure.travis-ci.org/gregbell/active_admin.png?branch=master" />}[http://travis-ci.org/gregbell/active_admin] {<img src="https://codeclimate.com/badge.png" />}[https://codeclimate.com/github/gregbell/active_admin] {<img src="https://gemnasium.com/gregbell/active_admin.png" />}[https://gemnasium.com/gregbell/active_admin]
 
 == Documentation & Support