Style merge request CI widget to match MR/Issue box

![Screenshot 2014-10-07 15.13.12](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/7208a92094/Screenshot_2014-10-07_15.13.12.png)

![Screenshot 2014-10-07 15.13.25](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/f04d8d3f7b/Screenshot_2014-10-07_15.13.25.png)

See merge request !1158