Documentation for Issue Boards

## What does this MR do?

Add documentation for issue boards.

## What are the relevant issue numbers?

- Issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/17907
- Backend MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5548
- Frontend MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5554

See merge request !5713

Split Koding admin/user docs

Backend/Frontend MR https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5909

See merge request !5938

Add Ruby 2.3 upgrade notes.

The 8.10 to 8.11 docs didn't mention Ruby 2.3, now they do.

See merge request !5940

Fix location of markdown help

Resolves #21208, and incorrect link to the markdown style guide

See merge request !5945

Fix for update 8.10-to-8.11.md doc.

Fixed a typo in the docs to update Ruby.

See merge request !5941

Remove tab stop from issuable form added by description templates

See merge request !5929

Fix typo in gitlab-workhorse header

See merge request !5891

Bump SimpleCov merge timeout to 365 days

## What does this MR do?

In case that CI pipeline fails because of intermittent errors in one of the jobs, when someone retries the only failing job located in the middle stage, the job that calculates compound coverage that is configured in later stage, and triggered after retrying job in the pipeline, will still return an accurate coverage value.

Closes #21144

See merge request !5932

Fixed enter key in search input not working

## What does this MR do?

Fixes a bug where the enter key wouldn't search in the top nav search input

Closes #20627 

See merge request !5888

Fix project namespace links

#### What does this MR do?
Fixes pipeline links

#### Why was this MR needed?
Links went to a 404 on fork MR pipelines tab

#### What are the relevant issue numbers?
Closes #21107

See merge request !5912

Fix incorrect "stopped impersonation" log message

Minor bug: Usernames were swapped in the log message.

Closes #21015

See merge request !5949

Also check if Akismet is enabled, before showing the `Submit as spam` button.

Fixes #21229

See merge request !5948

Fix Spinach branches spec

I broke master by adding a branch to gitlab-test for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5961, which put the branch in this scenario off the first page 😆 

See merge request !5964

Fix file links on project page Files view

## What does this MR do?

Fix the project show page when the default view is set to Files so that the links work.

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

I can't figure out what caused this to break 😕 

## What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-com/support-forum/issues/959.

## 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) (N/A)
- [x] API support added (N/A)
- Tests
  - [x] 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)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5933

Fix inputs not being found due to incorrect class in wrap element

Fixes failing spec

See merge request !5926

Fix empty dropdown

Deselecting the current selected option on a dropdown they were removing the input related to them.
This led to a unexpected cases. The forms were submitted without all required inputs and the label was still indicating an option was selected. This MR fixes that.

See merge request !5927

17465 Fixed dropdown cursor key navigation

## What does this MR do?
This MR fixes the use of cursor/arrow/enter key events with search dropdowns, allowing a user to navigate up and down the list with the arrow keys and then select their item with the enter key.
It also applies some *minor* scroll user experience fixes, such as resetting the selected dropdown item every time it opens/closes (also stops multiple dropdowns conflicting) and forcing the dropdown scroll to scroll right to the top or bottom depending on whether they have selected the first or last item, respectively.

## Are there points in the code the reviewer needs to double check?
I would like someone with GitLab experience to check over whether this would harm any unique implementations of the GitLabDropdown or SearchAutocomplete.

## Why was this MR needed?
The current version has incorrectly behaving search dropdowns in the navbar, they either do not navigate using the keyboard or do not use the enter keystroke to select a highlighted item.

## What are the relevant issue numbers?
Fixes #17465.
Closes #20752.
Closes #21014.
**Contributes** to #20754.

## Screenshots (if relevant)
![17465.mp4](/uploads/1145abec226036abbaaa4aa46020f52b/17465.mp4)

See merge request !4781

Fix assorted rspec failures due to stale, cached user permissions

RequestStore is disabled in tests, but the Ability class was caching user permissions based on the user and project ID of previous test runs. Revise code to use RequestStore only if it is active.

See merge request !5919

Update gitlab-shell to v3.4.0

Part of Redis Sentinel support: gitlab-org/gitlab-shell#29

See merge request !5920

Fix Error 500 resulting when loading network graph

`discussion_id` may not be present when the SELECT call for notes does not include this attribute. Don't attempt to set the discussion ID unless the model contains the attribute:

```ruby
irb(main):019:0> notes[0]
  Note Load (10.3ms)  SELECT notes.commit_id, count(notes.id) as note_count FROM "notes" WHERE "notes"."project_id" = $1 AND (noteable_type = 'Commit') GROUP BY notes.commit_id  [["project_id", 13083]]
ActiveModel::MissingAttributeError: missing attribute: discussion_id
```

Closes #21119, #21128

See merge request !5922

Backport  changes from gitlab-org/gitlab-ee!581



See merge request !5884

Disable “issue by email” feature until it uses a different token

Separate token being worked on in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5914, but too late for 8.11.

See merge request !5915

Todos sorting dropdown

Implements #18135 

![todos_sorting](/uploads/bff76827c421628134dfb8b864e47c74/todos_sorting.png)  


- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry 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 !5691

Call `set_discussion_id` again in DiffNote `before_validation` because the order is important



See merge request !5913

Refactor description templates documentation

## What are the relevant issue numbers?

Refactors docs introduced by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4981

See merge request !5839

Koding Integration

## What does this MR do?

Will provide Koding integration with GitLab services. Forked from !4914.

## Are there points in the code the reviewer needs to double check?
I've introduced new layouts which might not be necessary, first time contributor. 

## Why was this MR needed?
We're planning to ship Koding with GitLab.

## What are the relevant issue numbers?
#12759 #14698 

## Screenshots (if relevant)

### Screencasts

http://recordit.co/BDMbhwgxPD
http://recordit.co/By0qiz1ClC

### Enable Koding in Application Settings

![image](/uploads/73a69421105c03aa2b0b47e2617d3fbc/image.png)

### Koding Dashboard
![image](/uploads/6c7dda34792280c0e4791e36af4eba11/image.png)

### Set up Koding Stack
1 - ![image](/uploads/d5c2b93f8e61b5cbffdb06f0267d485f/image.png)
2 - ![image](/uploads/44d9a9b574b8ac0c5eb553fb9653d5da/image.png)

### Run on Koding on Project Page

![image](/uploads/7d2b46221009074ffff75d66d5a1a555/image.png)

### Run in IDE on Merge Requests
![image](/uploads/65eed90c34c34b5fe7ad29ef9c717640/image.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] 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 !5909

Ace ventura

## What does this MR do?

Makes Ace only load when it's actually necessary. The only two places it seems to be used is for Snippets and the File (Blob) Editor.

Before minification or compression, this takes the application.js down from 2.2MB to 1.6MB, and also removes two inline scripts :D

Compressed/Minified: master: 317KB/1.1MB, ace-ventura: 220KB/771KB

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

That this doesn't just completely break anything.

## Why was this MR needed?

Ace is a big library, this allows us to only load it when necessary.

## What are the relevant issue numbers?

#14372

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [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 !4914

Added tooltip to label value in collapsed sidebar

## What does this MR do?

Adds a list of the issuables labels to a tooltip in the collapsed
sidebar. Limited to 5 otherwise the list could get crazy long.

Closes #19398

See merge request !5232

Implement pipeline hooks, extracted from !5525

Closes #20115

See merge request !5620

Wrap single lines of code; horizontally scroll multi-line code blocks

## What does this MR do?
Original problem: code blocks were wrapping in issue body

* Multi-line code blocks (```) should scroll horizontally
* Single lines of code (`) should wrap

## Why was this MR needed?
Inconsistent scrolling vs wrapping behavior

## What are the relevant issue numbers?
Closes #19619 

## Screenshots (if relevant)
![Screen_Shot_2016-08-04_at_2.32.30_PM](/uploads/a4abcc81b57ffaa8dc8ce2b70a24bc21/Screen_Shot_2016-08-04_at_2.32.30_PM.png)


See merge request !5675

Show wall-clock time when showing pipeline

Show wall-clock time when showing pipeline instead of cumulative builds time.

Closes #17007

See merge request !5734

Pipelines ui updates

* Fixes hover color width on build list
* Fixes alignment of status icon on commits page
* Add play icon SVG

Small UI bugs with recent MRs

![Screen_Shot_2016-08-17_at_5.54.32_PM](/uploads/a5f1a38eac332865b17d8d74eeaa5142/Screen_Shot_2016-08-17_at_5.54.32_PM.png)
![Screen_Shot_2016-08-17_at_5.56.43_PM](/uploads/90608eee3e83dbe14244ff2be5a8867e/Screen_Shot_2016-08-17_at_5.56.43_PM.png)
![Screen_Shot_2016-08-18_at_9.18.37_AM](/uploads/9c1265fc3efa7b6084e2368d3fe458cd/Screen_Shot_2016-08-18_at_9.18.37_AM.png)

See merge request !5856

Render coverage badge using latest successful pipeline

## What does this MR do?

This MR make test coverage badge to report value for the latest successful pipeline, instead of the latest one, regardless the status.

Latest pipeline is often running, which makes coverage report inaccurate. Latest pipeline can be also the failed one, which may mean that not all stages got processed, therefore coverage report can be inaccurate as well.

This also improves coverage badge performance because it is not necessary to touch repository to get recent SHA on the branch.

## Why was this MR needed?

See #21013

## What are the relevant issue numbers?

Closes #21013

## 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)
- 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 !5862

Fix layout of edit tags page

#### What does this MR do?
Fixes layout of edit tags page

#### Why was this MR needed?
Layout was broken

#### Screenshots (if relevant)
Before:    
![Screen_Shot_2016-08-18_at_1.33.00_PM](/uploads/9e9e52bdc0743971d6e0996e2c2030a0/Screen_Shot_2016-08-18_at_1.33.00_PM.png)
After:    
![Screen_Shot_2016-08-18_at_1.32.08_PM](/uploads/0a4a93508f0c98cb0788a2c70ee33f4e/Screen_Shot_2016-08-18_at_1.32.08_PM.png)


See merge request !5874

Add space under MR title

## What does this MR do?
Adds space underneath MR title because right now it's impossible to tell where the title ends and the first header of the MR body begins. 
Before:   
![Screen_Shot_2016-08-18_at_1.43.05_PM](/uploads/4e07892036b1d90217fdecbed31a9494/Screen_Shot_2016-08-18_at_1.43.05_PM.png)

After:    
![Screen_Shot_2016-08-18_at_1.42.22_PM](/uploads/1341d4d7c5bd0db21233f6ebb961bafc/Screen_Shot_2016-08-18_at_1.42.22_PM.png)


Note: We need to change our template to have the md headers `####` instead of `##`. Once that's been done it will look like this:
![Screen_Shot_2016-08-18_at_1.46.46_PM](/uploads/e30d432551debc15ec210e76dfcd3451/Screen_Shot_2016-08-18_at_1.46.46_PM.png)

See merge request !5875