UI improvements

* lighter color for comments count
* better UI for issue assigee.milestone block

See merge request !1551

* lighter color for comments count
* better UI for issue assigee.milestone block

Ui improvements

* improve UI for commits, issues and merge requests lists
* refactor commit css

See merge request !1550

Ui improvements

* update bootstrap
* move milestones and labels to the left
* make open/closed/all filter as tab
* make issues page more compact

For  #1871

See merge request !1549

Correctly set default projects limit for new users.

See #2014.

Note that the projects limit still isn't retroactively applied to existing users (probably as intended)

See merge request !1547

Add missing color codes for line anchors, fixes #8628

Document fun facts about omnibus-gitlab

I hope this helps developers understand some of the differences.

See merge request !1546

Revert upload refactor

See merge request !1548

This reverts commit 7d5f86f6.

This reverts commit ebd39fc0.