Add more usage data to EE ping

This MR loads the EE usage ping asynchronously on the admin application settings page and now includes the counts of the following items:

* Comments
* Groups
* Users
* Projects
* Issues
* Labels
* CI builds
* Snippets
* Milestones
* Todos
* Pushes
* Merge requests
* Environments
* Triggers
* Deploy keys
* Pages
* Project Services
* Issue Boards
* CI Runners
* Deployments
* Geo Nodes
* LDAP Groups
* LDAP Keys
* LDAP Users
* LFS objects
* Protected branches
* Releases
* Remote mirrors
* Web hooks

Closes #997

See merge request !735

Prevent secrets being pushed into repository

implements  #385  

Scan file names on each commit to prevent secrets being pushed into repository  

https://gitlab.com/gitlab-org/gitlab-ee/uploads/455b598caf475d6c261f271205fe2150/Screen_Shot_2016-09-08_at_20.10.02.png

See merge request !731

Load it asynchronously to prevent blocking a page load.

Closes #997

Add a container around usage data help-block to prevent horizontal scroll in Firefox

Closes #808

CE upstream

That merges changes from CE https://gitlab.com/gitlab-org/gitlab-ce/compare/4b6fd0df62a987d9a5f6f0ba3df8a986396901e0...1d51bc7dfd04886fa5af69a60bb509691d697813

See merge request !742

Return created status

## What does this MR do?
Properly handles status created which results in 500 when viewing Merge Request pipelines.

## 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?

- Tests
  - [x] Added for this feature/bug
  - [x] 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?
Closes #22286

See merge request !6404

Document how to download the latest build artifacts

## What does this MR do?

Document how to download the latest build artifacts.

Closes gitlab-org/gitlab-ce#22273

See merge request !6401

[ci skip]

Update GitHub importer documentation  to reflect current importer state

## What does this MR do?

Update the Github importer documentation to reflect the current importer state.

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/904

## Does this MR meet the acceptance criteria?

- [X] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)


See merge request !5987

improve wording on build and push images using GitLab CI docs

## What does this MR do?

Improve wording on build and push images using GitLab CI docs

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

No

## Why was this MR needed?

Poor wording

## Does this MR meet the acceptance criteria?

- [ ] [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
  - [ ] 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)
- [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 !6001

Formatting fix in doc/ci/examples/README.md

Just a tiny fix of wrongly formatted markdown link.

See merge request !6398

docs: fix typo, it should refer to `domain_blacklist_enabled` setting

## What does this MR do?

fix the documentation

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

N/A

## Why was this MR needed?

typo fix

## What are the relevant issue numbers?

N/A

## Screenshots (if relevant)

N/A

## Does this MR meet the acceptance criteria?

yes, it's just a typo fix in the documentation without any code or business logic changes

See merge request !5899

Document IAM Profile AWS S3 configuration key.

## What does this MR do?
Document additional parameters available to the backup rake job configuration. 

## Are there points in the code the reviewer needs to double check?
Probably not.

## Why was this MR needed?
Un-documented configuration options

## What are the relevant issue numbers?
#12756

## Does this MR meet the acceptance criteria?

- [ ] [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
  - [ ] 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 !5910

Fix line diff side-by-side line highlighting

## What does this MR do?

Fixes line highlighting in diff side-by-side view from working correctly.

The JS was looking for a class, but the class doesn't exist & instead it was a data attribute.

## Screenshots (if relevant)

![Screen_Shot_2016-09-13_at_10.26.15](/uploads/7aca730efb14d7bd6bad2a8712fe39d2/Screen_Shot_2016-09-13_at_10.26.15.png)

See merge request !6316

Scrolls active tab into middle of nav on mobile

## What does this MR do?

On mobile (or smaller screens) it scrolls the currently active tab into the middle of the nav.

## Screenshots (if relevant)

![Screen_Shot_2016-09-15_at_09.38.55](/uploads/4170271b53b9509a385fa7844fb3dc78/Screen_Shot_2016-09-15_at_09.38.55.png)

See merge request !6363

Simplified the CSS for issue boards

## What does this MR do?

It gained a lot of extra cruft through the different improvements etc. This removes a lot of the stuff which would hopefully also speed up the browser rendering.

- Removed flexbox from a lot of things which in turn reduces it's complexity.
- Removed styles that either aren't used or aren't needed.
- Various other improvements to the CSS.

Basically just improved the CSS by removing overly complex CSS. There are no visible changes to issue boards, just less CSS for the same results.

See merge request !6352

Fixed commit search UI

## What does this MR do?

Fixes the UI for commits in search.

If the scope of the search is commits then it renders the list in a `ul` to match the same styling as that on the commits UI.

## Screenshots (if relevant)

![Screen_Shot_2016-09-05_at_15.30.12](/uploads/f567a224be44d5a9b015ac5d1c399bd7/Screen_Shot_2016-09-05_at_15.30.12.png)

## What are the relevant issue numbers?

Closes #21868

See merge request !6205

Fix projects with remote mirrors asynchronously destruction (using pending_delete)

When we update the flag pending_delete to true and later try to 
destroy the remote mirror (through association callbacks) the remote mirror try to load the project, but it is out of the default scope so it just return nil.

As we need the project to remove the reference to the remote mirror but we’re going to delete the project and its repository is not needed to touch the repository to just remove that reference, so we just skip that step in that case

Closes #1021

See merge request !737

Fix anchor icon regression

An error in scss prevented the markdown header `:hover` anchor icon svg from linking correctly:

![Screen_Shot_2016-09-14_at_4.06.19_PM](/uploads/f4d31a17a58bd7cbde572f91c316dfe1/Screen_Shot_2016-09-14_at_4.06.19_PM.png)

The following currently 404s:  
<https://gitlab.com/assets/icon_anchor.svg>  

## What are the relevant issue numbers?

#20459 & !5577

See merge request !6358

Replace contributions calendar timezone payload with dates

## What does this MR do?
Fixes a ~regression bug introduced in !5784 whereby the calendar squares would not render due to a timezone mismatch between the server timezone and the browser (user) timezone. I am now returning the dates instead of the timezone from the backend. There's a good chance we will still have a calendar off by one error (which is an existing issue #1943) but passing dates should make sure that the calendar activity squares render correctly across timezones.

## Are there points in the code the reviewer needs to double check?
Double check that this displays the correct calendar squares when the GitLab instance is hosted in a different timezone than the user viewing it

## Why was this MR needed?
Fixes ~regression issue 😞 

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-09-13_at_9.47.06_PM](/uploads/d8b41b9b43320f021452e39f29b0e194/Screen_Shot_2016-09-13_at_9.47.06_PM.png)

After:
![Screen_Shot_2016-09-13_at_9.46.11_PM](/uploads/e09a3b35eef77ee1cf73b924c3815d3a/Screen_Shot_2016-09-13_at_9.46.11_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] 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?
Closes #21921

See merge request !6336

Use oj gem for faster JSON processing

See merge request !6395

It's mainly intended to improve Elasticsearch indexing performance
(through multi_json gem), but other gems could benefit from it too, like
grape.

Bump fog-aws and other dependent modules

fog-aws CHANGELOG: https://github.com/fog/fog-aws/blob/master/CHANGELOG.md

Notable improvements:

* Support for ap-south-1 region
* Fix for empty ETag values

Closes #22260

See merge request !6392

Merge branch '22256-nomethoderror-api-entities-note-missing-attribute-note-on-awardemoji-0x00000015142480' into 'master'

Fix API notes endpoint when posting only emoji

Closes #22256

See merge request !6387

Closes #22260

MergeRequest#environments now returns an empty array when diff_head_commit is nil

## Does this MR meet the acceptance criteria?

- [x] No CHANGELOG needed for a bug introduced in an RC.
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] 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)
- [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?

Closes #22246

See merge request !6379

Fixes incorrect reference to `@repository.root_ref` in _readme.html.haml.

Fixes #22083

See merge request !6369

Remove schema annotations completely

It removes schema annotations completely. The https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4099 has not done that

See merge request !6386