Resolve "Task List Checkbox Alignment"

## What does this MR do?

Replace the unmaintained `task_list` gem with the `deckar01-task_list` fork

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

 - I had to pin some dependencies in the fork to support `ruby < 2.2`, which added new version restrictions for 2 existing modules.
 - I triggered a build after I removed the patch to show the test passed with the new gem, then I removed the test, because this behavior is tested in the gem's repo now.

## Why was this MR needed?

 - The `task_list` patch was added with a comment that said it should be removed when merged upstream, but the repo got archived, so an upstream patch requires a fork.
 - #22470 can't be patched without warnings due to the way `task_list` uses Ruby constants.
 - There are additional outstanding `task_list` bugs that can be fixed once we switch to a fork.

## What are the relevant issue numbers?

 - #22466 
 - #22470
 - !6487

See merge request !6625

GrapeDSL for Award Emoji endpoints

Cherry-picked from !6330

See merge request !6629

Enable Import/Export for non-admin users

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/21315

Related https://gitlab.com/gitlab-org/gitlab-ce/issues/20857 and https://gitlab.com/gitlab-org/gitlab-ce/issues/20821/

See merge request !6080

Use custom Ruby images to test builds

It allows us to remove redundant steps of installing required dependencies for every build.


See merge request !4506

Better empty state for Groups view.

Implemented @hazelyang's [awesome design](https://gitlab.com/gitlab-org/gitlab-ce/uploads/9141470ed121f137a4074ae4e12c449c/groups-empty.png) for empty group views.

Fixes #20829 


### Design
![https://gitlab.com/gitlab-org/gitlab-ce/uploads/9141470ed121f137a4074ae4e12c449c/groups-empty.png](https://gitlab.com/gitlab-org/gitlab-ce/uploads/9141470ed121f137a4074ae4e12c449c/groups-empty.png)


### Screenshots
![Screen_Shot_2016-09-28_at_13.43.35](/uploads/e2ab668a412596205deb67c97af78a1d/Screen_Shot_2016-09-28_at_13.43.35.png)

![Screen_Shot_2016-09-28_at_13.44.54](/uploads/c4301166f353f0ee198aecdc46cdfe66/Screen_Shot_2016-09-28_at_13.44.54.png)

![Screen_Shot_2016-09-28_at_13.46.10](/uploads/92024e866871969ec7a28db4b8e87220/Screen_Shot_2016-09-28_at_13.46.10.png)

![Screen_Shot_2016-09-28_at_13.46.20](/uploads/f1b515c7aa09d06e80a419d98ff76fd6/Screen_Shot_2016-09-28_at_13.46.20.png)

![Screen_Shot_2016-09-28_at_13.46.34](/uploads/76cdd5f0e9d3c59d017df26172f7dd4d/Screen_Shot_2016-09-28_at_13.46.34.png)

See merge request !6566

Convert "SSH Keys" Spinach features to RSpec

See merge request !6639

GrapeDSL for Keys endpoint

No changelog item as it doesn't change behaviour
Cherry-picket from !6330

See merge request !6631

Update GITLAB_SHELL_VERSION to 3.6.3

Because VERSION at the gitlab-shell v3.6.2 tag was still 3.6.1: https://gitlab.com/gitlab-org/gitlab-shell/blob/v3.6.2/VERSION (my bad!)

VERSION at the v3.6.3 tag is now 3.6.3: https://gitlab.com/gitlab-org/gitlab-shell/blob/v3.6.3/VERSION

See merge request !6621

Fix broken left sidebar navigation

Sidebar navigation is broken and it's introduced in !6627. Sidebar pin and hamburger icons were `a` tag before with `#` link on them. That was the main reason why page jumps to top. !6627 was trying to prevent default action but it interferes with the navigation links. I don't want to tweak event listeners for sidebar, instead I just replaced `a` elements with `div` because I think there is no point to have them as `a`.

/cc @dzaporozhets @jschatz1 

PS: This MR basically reverts !6627. I don't want to add another revert commit instead I reverted it in my editor and committed.

See merge request !6648

Add a /wip slash command to toggle the 'WIP' prefix in the MR title

## Why was this MR needed?

As explained in #21225, it prevents you from having to click through the entire edit form just to mark an MR as WIP.

Closes #21225

See merge request !6259

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

Fix broken specs after merging !6265

See merge request !6647

Fortunately, only specs needed to be fixed, so that's good!
Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix page scrolling to top on sidebar toggle

## What does this MR do?

Prevents page from scrolling to the top when a user clicks sidebar closing hamburger icon as well as when a user is toggling sidebar pinning.

## Why was this MR needed?

When a user is closing the sidebar or pinning the sidebar the scroll position of the page should not be affected.

## 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 #22851

See merge request !6627

document the need to be owner or have the master permission level for the initial push

## What does this MR do?

It documents the new behavior as discussed on gitlab-org/gitlab-ce#22543, because the `/protected_branch` URL of empty repository is not available and could mislead users.

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

Don't think so

## Why was this MR needed?

When you create a repository on GitLab, command line instructions on its home page for the use case _"Existing folder or Git repository"_ invite you to `git push -u origin master`, but the very first push is now rejected if you are not `Owner` or attributed `Master` permission.

## Screenshots (if relevant)

![Capture_d_écran_2016-09-30_à_14.55.20](/uploads/6ee2d36b4a32cb3a5faa68a10c1813f0/Capture_d_écran_2016-09-30_à_14.55.20.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 [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 you do - 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?

- new behavior was introduced here : gitlab-org/gitlab-ce@71dec8b1b61e9e194d242d37b39416b72020936b
- lack of documentation was discussed at gitlab-org/gitlab-ce#22543

See merge request !6608

It toggles the 'WIP' prefix in the MR title.

Use `fa-right-arrow` instead of `fa-check` as the current build indicator in the build sidebar for better UX.

Closes #22499

See merge request !6501

Add link to comparison from system note, update changelog

## What does this MR do?
Adds a link to the comparison between the previous and latest version.

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

## Why was this MR needed?

## Screenshots (if relevant)

![Screen_Shot_2016-10-01_at_3.37.03_AM](/uploads/89b48dc1b2ed868cf5dd85300e6b37a0/Screen_Shot_2016-10-01_at_3.37.03_AM.png)

## 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
  - [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 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 #22773

See merge request !6607

Link to the "What requires downtime?" page from the Migration Style Guide

## What does this MR do?

Adds a link from migration style guide -> "What requires downtime?"

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

## Why was this MR needed?

The two pages really need to be read together, so having the link is helpful.

## Screenshots (if relevant)

## 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 [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 you do - 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?

See merge request !6636

[ci skip]

Add word-wrap to issue title on issue and milestone boards

## What does this MR do?
Adds word-wrap to the issue title found on the issue board and the milestone boards

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

## Why was this MR needed?
Improves UI

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-09-19_at_10.19.18_AM](/uploads/7b79fe87c12c0d9a89fff5c725c546a4/Screen_Shot_2016-09-19_at_10.19.18_AM.png)
![Screen_Shot_2016-09-19_at_10.19.14_AM](/uploads/80a7e37433c98a406806249f01fe72fd/Screen_Shot_2016-09-19_at_10.19.14_AM.png)


After:
![Screen_Shot_2016-09-19_at_10.18.54_AM](/uploads/e3a9420262a5d521478bea5601afafab/Screen_Shot_2016-09-19_at_10.18.54_AM.png)
![Screen_Shot_2016-09-19_at_10.19.04_AM](/uploads/b87d661bd1492777c4f677ea3ed09dcc/Screen_Shot_2016-09-19_at_10.19.04_AM.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 #22274

See merge request !6412

Merge branch 'jimmykarily/gitlab-ce-notify_current_user_when_merging_an_mr_after_build_succeeds' into 'master'

Notify current_user about automatic merge after successful build

It enables notifications to the initiator of a merge when the MR is flagged as "Merge when build succeeds".

Because when running Builds, quite some time passes between the user's
action and the actual Merge so it is a good thing to notify the
initiator of the Merge when it actually happens.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14409

See merge request !6534

Merge branch '21983-member-add_user-doesn-t-detect-existing-members-that-have-requested-access' into 'master'

Resolve "`Member.add_user`doesn't detect existing members that have requested access"

## What does this MR do?

This merge request handle the case when an access requester is added to a group or project (via the members page or the API).

In `Member.add_user`, if an access requester already exists, we simply accept their request (and set the `created_by`, `access_level` and `expires_at` attributes if given).

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

I've taken the opportunity to cleanup the whole `{Group,Project}Member.add_user*` methods since it was quite a mess.

## What are the relevant issue numbers?

Closes #21983

See merge request !6393

New `Members::RequestAccessService`

Part of #21979.

See merge request !6265

Preserve label filters when sorting

## What does this MR do?

Allows Issues that are already filtered by labels to be sorted without losing the label filters.

## Why was this MR needed?

Users don't expect to lose their label filters when sorting Issues.

## What are the relevant issue numbers?

Closes #20982

See merge request !6136

Added preventDefault for toggling sidebar off as well as for pinning
and unpinning the sidebar.

Closes #22851

Center the header logo

_Originally opened at !6507 by @AshleyDumaine._

- - -

## What does this MR do?

* Centers the header logo using `relative` positioning on the svg or img in the header-logo

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

## Why was this MR needed?

The custom wide header logos aren't centered after logging in as seen in #22494

## Screenshots (if relevant)

| Before | After |
| --------- | ------ |
| ![Screen_Shot_2016-09-24_at_3.35.26_PM](/uploads/576db77e0eb299b06d2a5abf341f058f/Screen_Shot_2016-09-24_at_3.35.26_PM.png) | ![Screen_Shot_2016-09-24_at_3.35.51_PM](/uploads/47237b6c28d438a6f255dffb8b3d39d4/Screen_Shot_2016-09-24_at_3.35.51_PM.png) |

Signout (for centering comparison):
![Screen_Shot_2016-09-24_at_3.35.59_PM](/uploads/4484313ff5841774769c4737584af7fc/Screen_Shot_2016-09-24_at_3.35.59_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
- [ ] 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 #22494

See merge request !6610

Changed zero padded days to no padded days in date_format

## What does this MR do?
Changed zero padded days to no padded days in date_format so that calendar spec tests will pass.

Specs were failing because it was looking for `Saturday Oct 01, 2016` when it should have been looking for `Saturday Oct 1, 2016`

## Are there points in the code the reviewer needs to double check?
None

## Why was this MR needed?
Fixes failing test

## Screenshots (if relevant)
None

## Does this MR meet the acceptance criteria?

- 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 #22861

See merge request !6634

Changed compare dropdowns to dropdowns with search input

## What does this MR do?

This changes the compare dropdowns from text inputs, that when clicked, open a dropdown of branches/tags to dropdowns that have a dropdown toggle and an isolated search input.

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

## Why was this MR needed?

This was needed to fix the poor UX highlighted in #22221, where opening the dropdown showed an initially filtered set of results because the dropdown toggle was the dropdown filter itself. The compare page is always loaded with `master` as each branch/tag selection, so when opening the dropdown, it would only show results matching `master`.

## Screenshots (if relevant)

![2016-09-27_18.28.10](/uploads/0ea1d91cb592c6e140ed62c336e77227/2016-09-27_18.28.10.gif)

## 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 [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 you do - 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?


Closes #22221

See merge request !6550

MR banner & flash notices updates

### What does this MR do?
* Moves the create MR banner below subnav
* Changes MR banner background to white
* Moves flash notices underneath subnav
* Adds container within flash notices to align with content

Closes #22767 
### Why was this MR needed?
It looked a bit out of place between the two navs & had unneeded spacing.

### Screenshots (if relevant)
Before:   
<img src="/uploads/c1676a1923893a7ba7e1c6d6a50d4ea6/Screen_Shot_2016-09-09_at_7.17.31_PM.png" width="800px">
After:   
<img src="/uploads/74a2d6c8c43b9a15cd535a2a7adb2685/Screen_Shot_2016-09-28_at_3.41.29_PM.png" width="800px">

Before:   
<img src="/uploads/285e3de31326c48de43bb48abd4d907c/Screen_Shot_2016-09-29_at_10.57.55_AM.png" width="800px">
After:    
<img src="/uploads/0877e3e45755e5ca36694c52ad2e6198/Screen_Shot_2016-09-29_at_10.56.04_AM.png" width="800px">

With both alert and broadcast message:
![Screen_Shot_2016-09-29_at_11.06.51_AM](/uploads/ba3963a73b5c82940533c369ec54ec50/Screen_Shot_2016-09-29_at_11.06.51_AM.png)


See merge request !6581

Add Frontend Development Guidelines to the Developer Documentation

## What does this MR do?

WIP incomplete draft of some Frontend Development Guidelines for contributors to the project, new hires, and for other projects and persons to look to for guidance.

These are all subject to removal, modification, etc. If you disagree with any of these, please feel free to voice your concerns :)

## Why was this MR needed?

There are a number of guidelines we currently follow implicitly, this makes them more official and available for reference/discussion.

It also exists as a reference for certain patterns we use which may be unfamiliar to new contributors, e.g. the per-page JS.

Feel free to give feedback on wording, missing sections/guidelines, whether a guideline should even exist, etc.

See merge request !5477