New colour scheme

old
![Screenshot_2015-12-17_14.14.53](/uploads/5d6ac28b6d99186485d727a72cc8a662/Screenshot_2015-12-17_14.14.53.png)

new
![Screenshot_2015-12-17_14.15.07](/uploads/06e07fa3716aa8664b1507b390270285/Screenshot_2015-12-17_14.15.07.png)

* Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/2577

See merge request !2151