Render stages in valid order

Currently stages in stages dropdown on builds page are not in valid order. It is important to display stages in other those are defined in the pipeline.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/21133

See merge request !6430

Lets the user choose a namespace and name on Github imports

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/14971

See merge request !5728

Use a ConnectionPool for Rails.cache on Sidekiq servers

See merge request !6429

Frontend for Merge Request Diff

This merge request improves the UX for the merge request diff feature which was recently implemented here (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6127). Specifically, it styles various parts of the diff feature to match the designs, it disables comment-related buttons in states where comments are disabled, and it adds a 'Show latest version' button for convenience.

## Are there points in the code the reviewer needs to double check?

I could use feedback on this MR's fidelity to the design.  

## Why was this MR needed?

Neccessary styling improvements for basic UX of this feature, and enabled comment buttons are not functional and thus need to be disabled in certain states.

## Screenshots (if relevant)

![57dd0755f0b14342305909](/uploads/318a44a3bc8b7fc5c9c6ef92ba92e511/57dd0755f0b14342305909.gif)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/21427
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6127

cc: @jschatz1 

See merge request !6343

Fix "Unsubscribe" link in notification emails that is triggered by anti-virus

## What does this MR do?

* The unsubscribe link in an email body only unsubscribes automatically when logged in, otherwise the user is asked for a confirmation.
* The unsubscribe link in an email header unsubscribes automatically whether logged in or not.

## Are there points in the code the reviewer needs to double check?

This addresses all the comments from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5241, I think!

## Why was this MR needed?

People were getting unsubscribed automatically by AV software.

## Screenshot

![Screen_Shot_2016-09-20_at_09.51.30](/uploads/083ee2865f1ad6c08e2ed97f1c4e7d0d/Screen_Shot_2016-09-20_at_09.51.30.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Fixes #17198.

See merge request !6223

Hide jump to next discussion button on commit notes

## What are the relevant issue numbers?

Closes #22354

See merge request !6428

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

Reduce duplication in AkismetService

See merge request !6362

Merge branch 'merge-request-push-compare-ui' of gitlab.com:gitlab-org/gitlab-ce into merge-request-push-compare-ui

LFS support for ssh enabled

## What does this MR do?
This is follow-up after https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6043 which is falsely shown as merged due to: https://gitlab.com/gitlab-org/gitlab-ce/issues/22334

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !6413

Closes #22354

- Fixed and added specs.
- Added different namespace options depending on user privilages
- Updated docs.

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

* Created a force=true param that will continue with the previous
  behaviour of the unsubscribe method
* Created a filter for not-logged users so they see a unsubsribe
  confirmation page
* Added the List-Unsubscribe header on emails so the email client can
  display it on top

Remove trailing spaces from messages in Gitlab::Regex

See merge request !6426

Fix broken spec due to last_activity_at updates being throttled

In https://gitlab.com/gitlab-org/gitlab-ce/builds/4218398, the build failed because the last_activity_at column was only being updated once per hour. We
can fix this spec by stubbing out the throttling and adjusting the spec to test the right event timestamp.

See merge request !6424

Fix download artifacts button link

## What does this MR do?

Fix download artifacts button link.

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug

## What are the relevant issue numbers?

Closes #22294

See merge request !6407

* upstream/master: (80 commits)
  Contributing via GH no longer encouraged.
  Update README.md to really fix icon
  Update README.md to fix icon
  Allow to set request_access_enabled for groups and projects using API
  Restrict last_activity_at updates to one per hour
  Solve code review comments
  Properly support Gitlab::Auth::Result
  Revert all changes introduced by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6043
  Move Gitlab::Auth.Result to separate file
  Added CHANGELOG
  Fix spec failures
  Support pushing via SSH
  Fix specs failures
  Don't leak build tokens in build logs
  Fix permissions for creating container images
  Fix old CHANGELOG entries
  Add linting for duplicate CHANGELOG versions (!6039)
  Ensure validation messages are shown within the milestone form
  Fix validation regexs (+1 squashed commit) Squashed commits: [f9a9315] Use : to test invalid environment name
  Fix scope of the CI config key nodes in jobs entry
  ...

In https://gitlab.com/gitlab-org/gitlab-ce/builds/4218398, the build failed
because the last_activity_at column was only being updated once per hour. We
can fix this spec by stubbing out the throttling and adjusting the spec to
test the right event timestamp.

Use gitlab-workhorse 0.8.2

Fixes rejected API git archive extensions; improves Sentry errors.

https://gitlab.com/gitlab-org/gitlab-workhorse/blob/master/CHANGELOG

See merge request !6388

Move LDAP user attributes to a method

## What does this MR do?

This is a change that supports an EE fix. This small change needs to be made in CE to prevent future merge conflicts. 
See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/736 for the EE changes.

See merge request !6377

Strip comments before sending keys to gitlab-shell

## Why was this MR needed?

https://gitlab.com/gitlab-org/gitlab-ce/issues/22167 encoding issues in comment text.

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/22167

See merge request !6381

Ensure invitees are not returned in Members API

## What are the relevant issue numbers?

Closes #22065

See merge request !6370

Add linting for duplicate CHANGELOG entries

## What does this MR do?

Extend `scripts/lint-doc.sh` so that it checks that there are no duplicate versions in CHANGELOG.

See merge request !6039