Improve MR widgets

Before:

![Screenshot 2014-10-14 17.49.03](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/0283aa379e/Screenshot_2014-10-14_17.49.03.png)

After:

![Screenshot 2014-10-14 17.48.58](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/ca9f2bae19/Screenshot_2014-10-14_17.48.58.png)

See merge request !1178