Avoid escaping relative links in Markdown twice

## What does this MR do?

Avoid escaping relative links in Markdown twice.

## Why was this MR needed?

Relative links with special characters (e.g. spaces) were escaped twice.

## What are the relevant issue numbers?

closes #25191, #25318

See merge request !7940

Stop DDOSing ourselves

## What does this MR do?

Adds `hiddenInterval` to `SmartInterval` settings. This will be the interval used whilst the tab is inactive. If this setting is not set it will `cancel` as it would have done before.

Adds `immediateExecution` to `SmartInterval` settings. This boolean will dictate whether to execute the callback once before the first interval or not.

Uses `SmartInterval` with the new `hiddenInterval` settings to slow the polling for the MR widget on inactive tabs.

Fixes issue where `SmartInterval`s `visibilitychange` listeners are not getting called because jQuery doesn't support them.

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

## Why was this MR needed?

We're ddosing ourselves on the MR page.

## Screenshots (if relevant)

![Screen_Shot_2016-11-25_at_18.36.25](/uploads/c4457c55872f592e921a50cf5462022e/Screen_Shot_2016-11-25_at_18.36.25.png)

~30 seconds difference between the first 2 requests _(a couple requests had fired already so it's backed off already)_.

_-changed to different tab-_

~2 minutes difference between the middle 2 requests.

_-changed tab back to MR-_

~10 seconds difference between the last 2 requests.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [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 [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 it does - 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 #24807

See merge request !7762

API: Add the project filter to the groups endpoint.

Related to #22928. Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/25420

See merge request !8034

Allow branch names with dots on API endpoint

closes #25030

See merge request !7963

Added hiddenInterval and immediateExecution settings, fixed visibilitychange listening, implemented with mr widget

Updated tests

Added tests

Review changes

fix: 25294 - remove signed_out notification

Closes #25294

See merge request !7958

Fix alignment for notification settings ajax response

## What does this MR do?

Fixes a issue where an AJAX call to change your global notification settings will return an html partial which has the incorrect dropdown alignment class, in some cases causing the dropdown menu to become obscured on the left side of the screen.

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

## Screenshots (if relevant)

See issue #25510 for a screenshot of the problem and steps to reproduce.

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) 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 [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 it does - 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 #25510

See merge request !8024

test: replaced signed_out message check with check for sign_in button

fixes #25294

Adding support for personal snippet endpoint on the API

Closes #22042

See merge request !6373

Fix typo

See merge request !8029

Fix typo in curl example request

See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html

## What does this MR do?

Fix a typo in a curl example
Closes #23834 

## Moving docs to a new location?

See the guidelines: http://docs.gitlab.com/ce/development/doc_styleguide.html#changing-document-location

- [ x] Make sure the old link is not removed and has its contents replaced with a link to the new location.
- [ x] Make sure internal links pointing to the document in question are not broken.
- [ x] Search and replace any links referring to old docs in GitLab Rails app, specifically under the `app/views/` directory.
- [ x] If working on CE, submit an MR to EE with the changes as well.

See merge request !8030

Change docs title to represent the edition

See merge request !8026

Use default btn styling for Housekeeping button on projects settings page

Changes the Housekeeping button styling on the project settings page from ```btn-save``` to ```btn-default```

**BEFORE:** ![Screen_Shot_2016-12-06_at_12_51_42_PM](/uploads/1b1c8a26eead025062e2c98d9d0f4286/Screen_Shot_2016-12-06_at_12_51_42_PM.png)

**AFTER:** ![Screen_Shot_2016-12-06_at_12_51_57_PM](/uploads/9e7937af4a058fa1aa8b45653dbad3ee/Screen_Shot_2016-12-06_at_12_51_57_PM.png)

Closes #25324 
cc: @awhildy

See merge request !7959

fix display hook error message

## What does this MR do?

Fix hook error message display.  

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

Probably Hook will return the plain multi line text.  It is better `pre` tag than `h4`.  
I thought of another good looking display, but I did not come up with it. 😓 

## Why was this MR needed?

When the hook returns an STDERR, "Merge in progress" button spinning forever. Due to javascript's error.  

## Screenshots (if relevant)

When update hook returns an error like

```
XXXXXXXX

YYYYYYYY
ZZZZZZZZ
```

![screen_shot](/uploads/8dac77972a309dfcb72c741dffbd7270/screen_shot.png)

## What are the relevant issue numbers?

Closes #24020

See merge request !7775

Stop replacing `$your_email` with the user's email in the `/help` pages

See merge request !8014

Remove 'Leave Project' and 'Leave Group' from settings dropdowns

## What does this MR do?

Removes `Leave Project` and `Leave Group` from the settings dropdown.

Adds it to the `views/shared/members/access_request_buttons.html.haml`.

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

## Why was this MR needed?

## Screenshots (if relevant)

![Screen_Shot_2016-11-19_at_15.34.26](/uploads/5c66a025513b4780a9e881f0036381e4/Screen_Shot_2016-11-19_at_15.34.26.png)
![Screen_Shot_2016-11-19_at_15.35.29](/uploads/ed74a5dfe982cf65bb49c0c4fb307061/Screen_Shot_2016-11-19_at_15.35.29.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) 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
  - [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 it does - 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 #23305

See merge request !7600

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7383#note_19581826

Use gitlab-workhose 1.1.1

Change CI API rate limiting behavior.

Will make a separate MR for 8-14-stable because that version lacks the workhorse install rake task.

See merge request !7990

Updates the font weight of button styles because of the change to system fonts

## What does this MR do?

Updates the font weight of button styles because of the change to system fonts

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

## Why was this MR needed?

Because of the change to system fonts the font weight for buttons needed to be toned down a bit.

Seems only buttons styles were affected.

## Screenshots (if relevant)

left = result

![image](/uploads/c75868dca76561cafd559fb721be0601/image.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) 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 it does - 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?


cc: @cperessini

See merge request !8012

Updated members dropdowns

## What does this MR do?

EE has different dropdowns to allow for group LDAP members to be overridden, this ports the dropdown changes over to reduce conflicts.

## Screenshots (if relevant)

![Screen_Shot_2016-12-07_at_15.28.20](/uploads/6cb6def34015b024dc878aa3b99be4a0/Screen_Shot_2016-12-07_at_15.28.20.png)

See merge request !7974

we don't have to check for deploy key for downloading
because deploy key could certainly download when it
could already read the project.

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7383#note_19578626

Use a single query in Projects::ProjectMembersController to fetch members

See merge request !7997

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7383#note_19579483

Update "Installation from source" guide for 8.15.0

Following the steps from https://gitlab.com/gitlab-org/release-tools/blob/master/doc/release-candidates.md#creating-rc1.

See merge request !8015

Resolve "Provide SVG as a prop instead of hiding and copy them in environments table"

## What does this MR do?
- Provides SVG as a prop instead of manually manipulate the DOM to show it 
- Uniforms all props names in environments related components, 3 formats were being used and it was error prone
- Adds tests for the new SVG props.

## Why was this MR needed?
Technical debt.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [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
  - [ ] 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 it does - 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 #25374

See merge request !7992

The `$your_email` was removed from the SSH doc.
Signed-off-by: Rémy Coutable <remy@rymai.me>