Added the ability to block sign ups using a domain blacklist.

As part of this MR, I restructured the Application Settings form to separate **Sign up** related settings from **Sign in** related settings and make everything cleaner and easier to read.

Fixes #19749 

Related to #5573

See merge request !5259

Speed improvement for builds without DB

Only fetch the images which we are going to use. Speeds up the builds by about 30-45 seconds.

/cc @ayufan 

See merge request !4994

Warn on failure

## What does this MR do?

Adds styling and HTML for a `success_with_warnings` status in the MR widget. Unfinished as it needs some plumbing in the relevant CI controllers and models.

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

Not at the moment, though I think I'll probably need help getting this to work in the backend.

## What are the relevant issue numbers?

#17669 

## Screenshots (if relevant)

![Screen_Shot_2016-06-29_at_12.02.49_PM](/uploads/af4a915689633fe028f44bb34ae7a5b1/Screen_Shot_2016-06-29_at_12.02.49_PM.png)

## 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 [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)

cc: @ayufan 

See merge request !5004

Merge branch '14284-allow-all-deploy-keys-to-be-retrieved-via-api-regardless-of-project-affiliation' into 'master'

Add /deploy_keys API to retrieve all deploy keys regardless of project affiliation

## What does this MR do?

Add /deploy_keys API to retrieve all deploy keys regardless of project affiliation

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

Is documentation clear?

## Why was this MR needed?

User request

## What are the relevant issue numbers?

#14284

See merge request !4426

Fix side by side comment widget

Fixes comment button for empty lines in side by side diff view.

Fixes #19824 
Fixes #19957

See merge request !5262

Also, in favour of consistency, deprecate `/projects/:id/keys/...` routes in favour of
`/projects/:id/deploy_keys/...`

Add link to profile to commit avatar

## What does this MR do?

- links to user profiles to the avatars on commits page
- tooltips to the avatars on commits page

side effect:

- links to user profiles to the avatars on pipelines page
- tooltips to the avatars on pipelines page
- tooltips to the avatars on activity page
- mailto links to the avatars on activity page for non-registered users

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

Nope.

## Why was this MR needed?

There were no links nor Zeldas.

## What are the relevant issue numbers?

fixes #19644 


See merge request !5163

Added checks for migration downtime

This adds a set of checks that check/list which migrations require downtime (or not). It also comes with a CI task that fails should a migration not be tagged properly.

Fixes #14545

See merge request !4911

Enable Style/MultilineTernaryOperator rubocop cop

Avoid multi-line ?: (the ternary operator). Use if/unless instead.

See #17478

See merge request !4356

Allow slack service to send messages on different channels

closes #8110 

## Allow slack service to send messages on different channels  

![new_slack_service](/uploads/87de0bd6b02a4f7853358676b5e74dff/new_slack_service.png)

## 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
  - [x] All builds are passing
- [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)

See merge request !5124

Fix two small problems on how we handle manual actions

## What does this MR do?
Fixes two small problems in how we handle manual actions:
- On environments page we show a `Play` for the same action that is lately deployed, we should show other actions only
- When we process a pipeline that have only a manual action in a stage, the pipeline will stop being processed.

- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] 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)


See merge request !5366

Resolve "gitlab:setup rake task fails on 8.8.1 source install"

_Originally opened at !4788 by @rickettm._

- - -

## What does this MR do?

Fix bug #15344, so that the limit parameter that is already passed in to the print_users function is actually used, rather than using a hardcoded value.

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

No, it is a trivial change.

## Why was this MR needed?

This bug causes 100 LDAP users to be displayed even when a different limit is given, which can be annoying.

## What are the relevant issue numbers?

Fixes #15344.

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [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)

See merge request !5364

Remove icons from explore nav

## What does this MR do?
Removes icons from explore `nav/_explore`

## Why was this MR needed?
To match signed-in nav

## Screenshots (if relevant)
Before:   
![Screen_Shot_2016-07-20_at_6.39.01_AM](/uploads/9ccc11d151e37a0ef2fab681ccc07efa/Screen_Shot_2016-07-20_at_6.39.01_AM.png)

After:   
![Screen_Shot_2016-07-20_at_6.43.15_AM](/uploads/ae058b19cc3c887bccf6c221ac58cfc2/Screen_Shot_2016-07-20_at_6.43.15_AM.png)


See merge request !5362

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

Apply diff view cookie on compare

## What does this MR do?

Correctly respects the code view changing when comparing 2 refs.

## What are the relevant issue numbers?

Closes #19573 

## Screenshots (if relevant)

![Screen_Shot_2016-07-07_at_12.38.07](/uploads/b6da78cc2bbc2c79dbe8292037176c1a/Screen_Shot_2016-07-07_at_12.38.07.png)

![Screen_Shot_2016-07-07_at_12.38.17](/uploads/977f8b697c65bdb1701db11a39287ac6/Screen_Shot_2016-07-07_at_12.38.17.png)

See merge request !5135

Resolve "Move Build badges settings to Builds page (or Builds settings)"

## What does this MR do?
Removes pipeline settings section from project settings & creates a new pipelines settings page    
Adds builds badge to pipelines settings page & removes badge page

## Are there points in the code the reviewer needs to double check?
All Rails updates -> particularly `builds_controller.rb` and `routes`   
Spacing needs to be updated across all settings pages and will be in a separate MR (https://gitlab.com/gitlab-org/gitlab-ce/issues/19827)

## What are the relevant issue numbers?
Closes #15343    
Part of #18920 

## Screenshots (if relevant)
![Screen_Shot_2016-07-19_at_5.47.29_AM](/uploads/48e6d203de4cbe0b697280128695d980/Screen_Shot_2016-07-19_at_5.47.29_AM.png)
![Screen_Shot_2016-07-14_at_9.25.13_AM](/uploads/59118440f3e7bb903f44260abb119376/Screen_Shot_2016-07-14_at_9.25.13_AM.png)

See merge request !5244

Fix Issue 19641 (new snippets style bug)

## What does this MR do?
Fixes Issue 19641 (new snippets style bug)

## Are there points in the code the reviewer needs to double check?
Shouldn't be

## Why was this MR needed?
Requested in issue 19641 by Fatih Acet https://gitlab.com/gitlab-org/gitlab-ce/issues/19641

## What are the relevant issue numbers?
19641

## Screenshots (if relevant)
![Screenshot_2016-07-09_13.25.39](/uploads/8ead7ea8f4aae7ccaa4d2ddc495b6fe3/Screenshot_2016-07-09_13.25.39.png)
## Does this MR meet the acceptance criteria?
Yes

- [ x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ NA] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ NA] API support added
- Tests
  - [NA ] Added for this feature/bug
  - [ X] All builds are passing
- [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)

See merge request !5170

Allow to disable user request access to groups/projects

fixes #18585 

![projects](/uploads/9f381e77ffbcd2ecdbabdb8b201b95e4/projects.png)  

![namespaces](/uploads/4b8d39c80576b499118373f0a221882c/namespaces.png)

## 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)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [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)

See merge request !5286

Add predefined CI variables to GitLab

## What does this MR do?
This adds predefined CI variables to GitLab for container registry, pipelines, project name, etc. It also makes sure that all currently documented variables are send from GitLab. This is added to follow up on this proposal: https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/issues/185#note_11844286. To migrate almost all variables out of Runner to GitLab to simplify adding a new of variables without the need for changing the GitLab Runner.

## Why was this MR needed?
Our CI variables miss a lot of crucial information that should be easily accessible. This tries to fill this gap.

## What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/issues/185, https://gitlab.com/gitlab-org/gitlab-ce/issues/18164, https://gitlab.com/gitlab-org/gitlab-ce/issues/18075.

## 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 [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)


See merge request !4826

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

Updated fork page UI

## What does this MR do?

Updates fork page to new UI.

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

😕 

## Why was this MR needed?

'coz new forks page looks awesome, that's why!

## What are the relevant issue numbers?

Closes #17810.

## Screenshots (if relevant)

![Screen_Shot_2016-07-07_at_03.43.45](/uploads/d4be046d1a6b043f3691633b7ec396c6/Screen_Shot_2016-07-07_at_03.43.45.png)

[youtube video](https://youtu.be/YpXPCxWGCnY)

## 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
- [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)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5007

Replace namespace-specific application.js files with namespace-bundle.js files.

Following up on the per-page JavaScript improvements, I wanted to replace the use of `application.js` with `namespace-bundle.js` to prevent confusion when downloading more than one application.js file.

This is pretty much just for the sake of clarity.

cc: @alfredo1 

See merge request !5221

Avoid multi-line ?: (the ternary operator). Use if/unless instead.

See #17478

Log cron_jobs configuration instead of raising exception

## What does this MR do?

Log cron_jobs configuration errors and remove invalid key <-> values from the configuration hash instead of raising an exception.
This has been discussed at #20010.

Fixes #20010

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

## Why was this MR needed?

Original implementation !5318, introduced a regression with our docker packaging: #20010.

## What are the relevant issue numbers?

* #20010 
* #18378

## 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 [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)

See merge request !5360

speed up ExternalWikiService#get_project_wiki_path

## What does this MR do?

Speed up ExternalWikiHelper#get_project_wiki_path

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

## Why was this MR needed?

See issue #19886 

## What are the relevant issue numbers?

#19886 

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [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 [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)

See merge request !5305