Improves animation

* master: (30 commits)
  Add GitLab host to 2FA QR and manual info
  Fix broken test
  Fix rubocop
  Fix specs in Ruby 2.1
  Clearer comment as to why the procedure is needed
  Ensure issuable state changes only fire webhooks once
  Improve performance on RemoveDuplicatesFromRoutes migration
  Fix the AddNameIndexToNamespace migration to be reversible
  Use optimized query to fill the routes table when running PostgreSQL
  Don't use the Route model in migrations
  Added KaTeX license and procedure to build it for Gitlab
  [ci skip] UX Guide: add guidance on cursor usage
  Changes after review
  Add missing group policy spec
  Limit description container for mrs while viewing side by side diff
  Refactor Namespace#parents method
  Change SlackService to SlackNotificationsService
  Made Ci::Builds to have same ref as Ci::Pipeline in dev fixtures
  Mattermost Notifications Service
  Replace static fixture for abuse_reports_spec (!7644)
  ...

Resolve "Manual actions on pipeline graph"

## What does this MR do?
Improves the pipeline graph:
- add actions to each node
- always show the status icon
- improves style
- adds new icons to use only on the pipeline graph
- fixes tooltip body
- adds partial to render the graph node

### Hover state:
@dimitrieh 

This MR does not implements 100% of the mockups - https://gitlab-org.gitlab.io/gitlab-design/progress/dimitrie/pipelines-graphic/22604-spec-previews/#artboard0

As you can see in the mockups, each node has 2 separate hover states, one for the all content and one for the action icon.
In order to not hover the all content when we hover the action icon we would need to refactor the all HTML & CSS of all the pipeline graph, lines included.
The hover problem can be seen in the following video.
[video](https://drive.google.com/file/d/0B2xW80W4hUf0cnJoS1RGQ2hWZlU/view)

As you can see in the video, the build node is hovered even when the mouse seems to be far from the element.

It does not seem wise to me to change the HTML & CSS now for two reasons:
- we would need to rewrite almost everything;
- we will probably rewrite everything when we move this to vue.

Given the latter point, and considering it will be a bug effort to make the hover states equal to the mockups, I suggest we do that when we rewrite the all view.
This is fixable, though, but requires some effort & time.

I can, although, be missing something. @annabeldunstone do you see any quick/easy fix here?


## Screenshots (if relevant)
[video](https://drive.google.com/file/d/0B2xW80W4hUf0OFhZaXlKTW5mS3c/view?usp=sharing)

![Screen_Shot_2016-12-12_at_12.38.25](/uploads/8f015b0d476c832912e1530208f3d70d/Screen_Shot_2016-12-12_at_12.38.25.png)
![Screen_Shot_2016-12-12_at_12.38.31](/uploads/51de435f1120142d9683f06854d66507/Screen_Shot_2016-12-12_at_12.38.31.png)
![Screen_Shot_2016-12-12_at_12.38.39](/uploads/642e7348bcf46a03d13d8eac1cb7ce6b/Screen_Shot_2016-12-12_at_12.38.39.png)
![Screen_Shot_2016-12-12_at_12.40.00](/uploads/781743893bc14cf05f4b8f258e2b58ba/Screen_Shot_2016-12-12_at_12.40.00.png)


Tooltip before
![Screen_Shot_2016-12-06_at_11.29.54](/uploads/b16c0434981a89fb68c4c053c2f1d6e6/Screen_Shot_2016-12-06_at_11.29.54.png)
Tooltip after
![Screen_Shot_2016-12-06_at_11.56.03](/uploads/e5e0ede0f3f8a5434e98373ab8a72500/Screen_Shot_2016-12-06_at_11.56.03.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
  - [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 #22604


See merge request !7931

Ensure issuable state changes only fire webhooks once

Webhooks were fired twice when issuables were reopened or closed. Once for the status change and once for the `update` operation

Closes #25339

See merge request !8101

Shorten line length of issues and mrs

Limits container width on issue and mr pages. Shortens line length to human readable length.

![Screen_Shot_2016-12-02_at_12.48.08_PM](https://gitlab.com/gitlab-org/gitlab-ce/uploads/740647c0fd6ea4f0f0aef62155992afe/Screen_Shot_2016-12-05_at_12.54.12_PM.png)

Closes #20916 
Closes #24408

See merge request !7858

Add GitLab host to 2FA QR and manual info

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/25545

See merge request !6941

Added KaTeX license and procedure to build it for Gitlab

## What does this MR do?
Adds KaTeX license and the procedure for building KaTeX for gitlab. 

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

## Why was this MR needed?
Requested by @stanhu

## Screenshots (if relevant)
Not relevant. 

## Does this MR meet the acceptance criteria?

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

See merge request !8132

The two factor authentication account string only had the user's
email address. This led to ambiguous entries in two factor
code generating apps. This adds the GitLab host to the account
string in the standard format (according to Google). No matter
the code generator this change disambiguates the entry.

Mattermost Notifications Service

## What does this MR do?
closes #22269 

## Screenshots 

![mattermost](/uploads/de71c121f544a91305b6dfa6dc4c5738/mattermost.png)  
![slack](/uploads/081d75d49239319d94332abda214fb98/slack.png)

## Does this MR meet the acceptance criteria?

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


See merge request !7764

Fix 8.15 RC1 requires quite amount of downtime

See https://gitlab.com/gitlab-org/gitlab-ce/issues/25635

See merge request !8106

Update grape to 0.18.0

## What does this MR do?

Update grape to 0.18.0. Required for the settings API.

## What are the relevant issue numbers?

#22928

See merge request !8057

Fix specs in Ruby 2.1

Ruby 2.1 requires a basename argument to `Tempfile.open`, so just call
it something that makes sense in context for the spec.

See merge request !8138

Replace static fixture for abuse_reports_spec

## What does this MR do?

Replace static HAML fixture for `abuse_reports_spec` by dynamically created one.

## What are the relevant issue numbers?

#24753

See merge request !7644

Add missing group policy spec

See merge request !8122

Made Ci::Builds to have same ref as Ci::Pipeline in dev fixtures

See merge request !8110

Update custom hooks docs and set 4.1.0

See merge request !8040

Ruby 2.1 requires a basename argument to `Tempfile.open`, so just call
it something that makes sense in context for the spec.

UX Guide: add guidance on cursor usage

Add guidance to the UX guide on when to use what mouse cursor.

See merge request !8128

* Webhooks for close and reopen events now fired in respective services only
* Prevents generic 'update' webhooks firing too

* master: (51 commits)
  Fix spec/features/admin/admin_active_tab_spec.rb
  Fix eslint errors
  Don't open Asciidoc module twice
  Add `gitlab_rails['auto_migrate'] = false` to HA docs for Redis/PG [ci skip]
  Unify margin widths
  Add $CI_ENVIRONMENT_NAME and $CI_ENVIRONMENT_SLUG
  Add Okta authentication documentation
  Create environments when the build referencing them is created
  Add an environment slug
  Make the index on environment name and project id unique, fixing up any duplicates
  Rename `issue create` slash command to `issue new`
  Add changelog for !7850.
  Update Mattermost slash commands docs to explain how to create a newline and use <kbd> for user input. See HTML5 spec: https://www.w3.org/TR/html5/text-level-semantics.html#the-kbd-element
  Improve `issue create …` slash command with user input keys to create a newline in chat clients.
  Add explicit status test, feedback:
  Don't call anything on a block, use simple if
  Use described_class and update description
  Also use latest_status, feedback:
  Fixed bug with +1 not autocompleting
  added changelog entry
  ...

* master: (51 commits)
  Fix spec/features/admin/admin_active_tab_spec.rb
  Fix eslint errors
  Don't open Asciidoc module twice
  Add `gitlab_rails['auto_migrate'] = false` to HA docs for Redis/PG [ci skip]
  Unify margin widths
  Add $CI_ENVIRONMENT_NAME and $CI_ENVIRONMENT_SLUG
  Add Okta authentication documentation
  Create environments when the build referencing them is created
  Add an environment slug
  Make the index on environment name and project id unique, fixing up any duplicates
  Rename `issue create` slash command to `issue new`
  Add changelog for !7850.
  Update Mattermost slash commands docs to explain how to create a newline and use <kbd> for user input. See HTML5 spec: https://www.w3.org/TR/html5/text-level-semantics.html#the-kbd-element
  Improve `issue create …` slash command with user input keys to create a newline in chat clients.
  Add explicit status test, feedback:
  Don't call anything on a block, use simple if
  Use described_class and update description
  Also use latest_status, feedback:
  Fixed bug with +1 not autocompleting
  added changelog entry
  ...

UI improvements for nested group feature

See merge request !8062

Fix eslint errors

Fixes current eslint errors on master

See merge request !8127

Fix spec/features/admin/admin_active_tab_spec.rb

See merge request !8130

Don't open Asciidoc module twice

See merge request !8119

Add Okta authentication documentation

Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/14122

See merge request !8104

Add `gitlab_rails['auto_migrate'] = false` to HA docs for Redis/PG [ci skip]

## What does this MR do?

In a high availability configuration, the Redis and PostgreSQL nodes
should not attempt to run database migrations. In fact, trying will
result in errors about not providing a database password. To
prevent errors and confusion, add this configurtion to these nodes'
`gitlab.rb` file.

See merge request !8112

Merge branch '25144-gitlab-ce-mattermost-slash-command-for-issue-create-needs-better-documentation' into 'master'

Resolve "gitlab-ce mattermost slash command for issue create needs better documentation"

## What does this MR do?

Updates the documentation and the <kbd>help</kbd> command to be clearer, having the keys used to add a newline in chat clients (both Mattermost and Slack). 

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

* Are the available commands (via <kbd>help</kbd>) being formatted as `<code>` ?

## Why was this MR needed?

`\n` represents a new line character and doesn't communicate how the user should input the command. Also, to be correct, the documentation should use `<kbd>` instead of `<code>` for user input ([see HTML5 specification](https://www.w3.org/TR/html5/text-level-semantics.html#the-kbd-element))

## Screenshots (if relevant)

| Mattermost | Docs |
| --- | --- |
| ![image](/uploads/539526a14bfd551b7e732dd96c5b7581/image.png) | ![image](/uploads/e3eb099f86c5a32ce3b8954e72c29848/image.png) |

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- Tests
  - [ ] All builds are passing

## What are the relevant issue numbers?

Closes #25144

See merge request !7850