Style merge request CI widget to match MR/Issue box

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
add references to gitlab flow article
Merge branch 'gitlabflow-references' into 'master'

Gitlabflow references

See merge request !1160
Merge branch 'mr-widget-css' into 'master'

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