CE 7.3.2

See merge request !187

Conflicts:
	VERSION

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Merge 7.3.1 CE into EE

See merge request !182

This conmmit fixes wierd behaviour when you see wrong comments about new
commits in merge requests.

Short explanation of a bug:
When you push new commits to project we updated `project.merge_requests`
with comment about push. But `project.merge_requests` includes also
merge requests from forks to origin project. So when you push to master
branch it commented on all merge requests from forks to origin where
source_branch was `master`

Conflicts:
	VERSION

Conflicts:
	VERSION

Conflicts:
	doc/install/installation.md

Revert sticky headers

See merge request !1104

This reverts commit 6eb85b1a.

Save last scrollposition and scroll back when leaving ZEN mode

improve 7.3 upgrade process & redis setup

update gitlab shell to 1.9.8 for gitlab 7.2.2