Environment links not shown in MR widget

When requesting ci_environment_status, we should get the markup required to show a environments link in the MR widget.

gitlab-com/www-gitlab-com!4604 (closed) Screen_Shot_2017-01-23_at_14.14.38

https://gitlab.com/gitlab-com/www-gitlab-com/environments Screen_Shot_2017-01-23_at_14.14.52

Screen_Shot_2017-01-23_at_14.15.00

As you can see above, I have successfully deployed a review app, but it is not shown in the MR widget.