Search ui update

Closes #2537 

See merge request !3751

This reverts merge request !3839

Document that only unicorn and sidekiq should be stopped.

And the rest of GitLab should remain running.
Also clarified the rest of the GitLab Omnibus restore procedure.

See merge request !3839

Update PROCESS.md

Fix grammar by adding missing "we" 
Add extra newline so example isn't part of list.

See merge request !3845

Throttle the update of `project.last_activity_at` to 1 minute

This implement [the solution](https://gitlab.com/gitlab-org/gitlab-ce/issues/15094#note_4769387) proposed by @jacobvosmaer.

See merge request !3848

Changed some variable names
Fixed CHANGELOG entry

Correct search results count

CHANGELOG item

Upgrade gitlab-grit gem to 2.8.1, loosening the mime-types gem's version dependency.

Changelog for mime-types: https://github.com/mime-types/ruby-mime-types/blob/master/History.rdoc

Resolves #15101.

See merge request !3901

Link user avatar in activity page to user profile

Closes #14927

See merge request !3910

Move CHANGELOG entry to 8.8

Fixes CHANGELOG entry for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3686

See merge request !3914

Fixes issue with emoji comments not showing correct emoji image

Previously it would look for the unicode character inside the award menu. But this menu might not always be there.

Now, the unicode characters are loaded onto the page in an array which the award emoji that looks in to get the correct emoji unicode character

Fixes #15512

See merge request !3885

Update diff blue & yellow to match design

<img src="/uploads/60e1351fb04ab1c8969685fbc8b61c88/Screen_Shot_2016-04-22_at_9.12.17_AM.png" width="500px">
<img src="/uploads/6812b22ec53f3041811261daa0584822/Screen_Shot_2016-04-22_at_9.12.05_AM.png" width="500px">

See merge request !3883

Replace '-n' with '--name' in docker related documentation

`-n` for `docker run` is outdated. We should use `--name` instead. This MR fixes the example in documentation.

Fixes #15174

See merge request !3908

Fix php-docker example (for new docker versions)

`/.dockerinit` file doesn't exists in new Docker versions. Instead `/.dockerenv` can be used. This MR fixes the PHP example which was working only for older Docker versions.

Fixes gitlab-org/gitlab-ci-multi-runner#1241

See merge request !3907

Triggers blur after clicking award button

![blur](/uploads/6cd53a5ac314e8048c656685935747e2/blur.gif)

Fixes #15511

See merge request !3881

Add new shortcuts

Closes #14904

- On a project: `i` To navigate to New Issue page.
- On a issuable: `l` To open Label dropdown on a issuable.
- Global: Typing `?` multiple times now toggles the modal.

See merge request !3686

Fixed issue with project dropdown links not being clickable



See merge request !3870

Don't break line in middle of word

<img src="/uploads/cceb1a4212ff7785ace03cd6468edf85/Screen_Shot_2016-04-21_at_3.32.00_PM.png" width="500px">

See merge request !3864

Fix error on commit builds page

This MR fixes error on commit builds page that occurs before CI commit
(Pipeline) had been updated.

Closes #15509

See merge request !3874

Add a branded 503 static error page

[ci skip]

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15398

See merge request !3894

Upgrade jQuery Rails from 4.0.5 to 4.1.1

Upgrades jQuery to 1.12.1 and jquery-ujs to 1.2.1.

Changelogs:
- https://github.com/rails/jquery-rails/blob/master/CHANGELOG.md
- https://blog.jquery.com/2016/01/08/jquery-2-2-and-1-12-released/
- https://github.com/rails/jquery-ujs/releases

See merge request !3642

Signed-off-by: Rémy Coutable <remy@rymai.me>

Closes #15509

Fix Error 500 due to stale cache when projects are renamed or transferred

See merge request !3865

Closes gitlab-org/gitlab-ee#506