Fix PostReceive failing for project mirrors missing local branch

Closes gitlab-ce#50843

See merge request gitlab-org/gitlab-ee!8495

Add docs on post-merge pipelines

See merge request gitlab-org/gitlab-ee!8530

Add docs for linking in changed pages from MR widget

See merge request gitlab-org/gitlab-ee!8531

[ci skip]

[ci skip]

New Crowdin translations

See merge request gitlab-org/gitlab-ee!8507

CE Port 22485 Creates /create_merge_request quickaction

See merge request gitlab-org/gitlab-ee!8484

Remove duplicate yarn.lock entry

See merge request gitlab-org/gitlab-ee!8529

Adds PHILOSOPHY.md and references Product Handbook

See merge request gitlab-org/gitlab-ee!8515

Stub Rails.application.env_config to prevent spec failures

Closes #8488

See merge request gitlab-org/gitlab-ee!8525

CE upstream - 2018-11-20 07:15 UTC

See merge request gitlab-org/gitlab-ee!8526

Refine cursor positioning in Markdown Editor for wrap tags.

Closes #54015

See merge request gitlab-org/gitlab-ce!23085

Remove unused partial

See merge request gitlab-org/gitlab-ce!23180

When we modify env_config, that is on the global Rails.application, and
we need to stub it and allow it to be modified in-place, without
polluting later tests.

When we modify env, then the context is a request, or something else
that only lives for a single spec.

Closes #8488

Show what RPC is called in the performance bar

See merge request gitlab-org/gitlab-ce!23140

CE upstream - 2018-11-19 22:21 UTC

See merge request gitlab-org/gitlab-ee!8521

Update docs for include to mention 'allow requests to local network' requirement

Closes #53595

See merge request gitlab-org/gitlab-ce!23055

Enable even more frozen string for lib/gitlab

See merge request gitlab-org/gitlab-ce!23161

Bump nokogiri, loofah, and rack gems for security updates

See merge request gitlab-org/gitlab-ce!23204

Bump ruby_parser to 3.11.0 for Ruby 2.5 compatibility

See merge request gitlab-org/gitlab-ce!23209

Rails5 deprecation: Passing a class as a value in an Active Record query is deprecated

See merge request gitlab-org/gitlab-ce!23164

loofah: CVE-2018-16468:
https://github.com/flavorjones/loofah/issues/154

nokogiri: CVE-2018-14404 and CVE-2018-14567
https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md

rack: CVE-2018-16471
https://github.com/rack/rack/commit/e5d58031b766e49687157b45edab1b8457d972bd

i18n: https://github.com/svenfuchs/i18n/releases

concurrent-ruby: https://github.com/ruby-concurrency/concurrent-ruby/blob/master/CHANGELOG.md

CE port of "qa-staging-15-use-existing-users-ee"

See merge request gitlab-org/gitlab-ce!22864

Use existing users in tests

Closes gitlab-org/quality/staging#15

See merge request gitlab-org/gitlab-ee!8266

add guide for creating runbook

See merge request gitlab-org/gitlab-ce!22885

See https://github.com/seattlerb/ruby_parser/blob/master/History.rdoc

CE upstream - 2018-11-19 17:21 UTC

Closes gitlab-ce#54093, gitlab-ui#65, and gitlab-ui#95

See merge request gitlab-org/gitlab-ee!8510

Fix typo in js (props, specs)

See merge request gitlab-org/gitlab-ce!23103

see https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22673

Increase rspec parallelization to 50

See merge request gitlab-org/gitlab-ce!23149