* upstream/master: (460 commits)
  Center dropdown for pipeline's  mini graph
  Documentation bugfix of invalid JSON payload example of Create a commit with multiple files and actions
  Fix filename method of GitlabUploader to return always real filename
  Ignore CVE-2017-5029 in Nokogiri
  Refactor atom builder by using xml.atom layout
  Let PhantomJS load local images
  Add a changelog entry
  Only add a description change note when no tasks are updated
  Doc: Add the need to upgrade to Go 1.8.3 in the 9.1->9.2 documentation as the upgrade fails with Go 1.5 (installed with Gitlab 8.1)
  Use gitaly 0.11.2
  Add the ability to perform background migrations
  Always render warnings icon in orange
  Fix a few translation for zh_TW
  Improve Job detail view to make it refreshed in real-time instead of reloading
  Attempts to run RSpec tests twice (1 retry)
  ignore name validation on importing
  Only show hover state on links and buttons
  Use vue files for navigation tabs and buttons
  doc: add example of scheduler when
  Add test for u2f helper and changelog entry
  ...

Center dropdown for pipeline's  mini graph

Closes #27586

See merge request !12087

Refactor atom builder by using a layout

See merge request !12114

Documentation bugfix of invalid JSON payload example of Create a commit with multiple files and actions

See merge request !12117

Documentation bugfix of invalid JSON payload example of Create a commit with multiple files and actions

Fix filename method of GitlabUploader to return always real filename

Closes #33524

See merge request !12113

Ignore CVE-2017-5029 in Nokogiri

Closes #33597

See merge request !12109

Let PhantomJS load local images

See merge request !12003

Set artifact working directory to be in the destination store to prevent unnecessary I/O

Closes #33274

See merge request !11905

Add an optional performance bar to view performance metrics for the current page

Closes #29010

See merge request !11439

Prevent Description Change Notes When Toggling Tasks

Closes #32834

See merge request !12057

This change fix a memory leak due to a Webkit bug:
https://github.com/ariya/phantomjs/issues/12903

Also:

- Whitelist only localhost and 127.0.0.1 in Capybara + JS specs
- Blacklist all requests to media such as images, videos, PDFs, CSVs etc.
- Log all the requests made.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Add the ability to perform background migrations

See merge request !11854

Attempts to run RSpec tests twice (1 retry)

See merge request !12066

Ignore commit status name validation on importing

Closes #33490

See merge request !12039

Use :request_store hooks on specs

See merge request !12058

Update gitlab-workhorse to v2.1.1

See merge request !12049

Fix a few translation for zh_TW

See merge request !12043

Generate patch with git diff instead of git format-patch

Closes #33525

See merge request !12060

Use gitaly 0.11.2

See merge request !12092

Doc: Add the need to upgrade to Go 1.8.3 in the 9.1->9.2 documentation as the upgrade fails with Go 1.5 (installed with Gitlab 8.1)

See merge request !12078

Doc: Add the need to upgrade to Go 1.8.3 in the 9.1->9.2 documentation as the upgrade fails with Go 1.5 (installed with Gitlab 8.1)

Fix FIDO U2F for Opera browser (based on !10118)

See merge request !12082

Background migrations can be used to perform long running data
migrations without these blocking a deployment procedure.

See MR https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11854 for
more information.

Always render warnings icon in orange

Closes #33132

See merge request !12061

Fall back to gzip when missing optional zopfli dependency

See merge request !12068

Accept avatar file in project API

Closes #33003

See merge request !11988

Improve Job detail view to make it refreshed in real-time instead of reloading

Closes #31397, #30901, #29948, and #24339

See merge request !11848

Test todos_count_format helper at the correct level to improve speed

See merge request !12075