Show categorised search queries in the search autocomplete

Fixes #5885 

It works in 3 categories, Dashboard, Groups and Project.

## Dashboard context
![for-dashboard](/uploads/3a59f6ec008a972495597c8f2691c385/for-dashboard.png)

## Group context
![for-group](/uploads/f7aa413d56330a1d9b2e5562f95badf7/for-group.png)

## Project context
![for-project](/uploads/dabe04cf8758a056cf7b03da001ffd91/for-project.png)


## Screencast
![category-search-dropdown](/uploads/4d9513dcd6ccb6e24adefdf65f9bc778/category-search-dropdown.gif)



See merge request !4499

Due date can be removed from milestones

## What does this MR do?

Adds a button to milestone form to allow user to remove due date 

## What are the relevant issue numbers?

Closes #15063 

## Screenshots (if relevant)

![Screen_Shot_2016-06-02_at_08.32.03](/uploads/8bd4446abde745dd5b1e140a887ec694/Screen_Shot_2016-06-02_at_08.32.03.png)

See merge request !4428

Fixed issue with bold in issuable sidebar

## What does this MR do?

~~The sidebar contained both normal font weight & bold font weight, so this standardises them to bold.~~

After looking at the designs, i've updated the font weights & colors throughout the sidebar to correctly match them

## Screenshots (if relevant)

![Screen_Shot_2016-06-02_at_11.03.40](/uploads/0a3eb6a67ce5722c77f6adf2fe883017/Screen_Shot_2016-06-02_at_11.03.40.png)


See merge request !4398

Add shortcut to copy file content hash link

## What does this MR do?

* Allows for multiple shortcut handlers to be initialised
* Adds `y` shortcut to file pages to copy permalink URL.

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

Ney.

## Why was this MR needed?

UX

## What are the relevant issue numbers?

Closes #14470.

## Screenshots (if relevant)

![y-shortcut](/uploads/b81feb26d8e0d7d4996c4afa29f385d7/y-shortcut.gif)

See merge request !4496

New issue shortcut doesnt work on some pages

## What does this MR do?

1. Slightly tidies dispatcher switch case by utilising 'fall through' cases.
2. Adds shortcuts to project pipelines, milestones, builds and forks pages

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

I have a feeling that these may have been missed out of the case statements on purpose?

## Why was this MR needed?

Possible UX issue highlighted in #17929.

## What are the relevant issue numbers?

Closes #17929.

Closes #12616. (dup)

Closes #18123. (dup)

Closes #13688. (dup)

## Screenshots (if relevant)

See merge request !4393

Updated CHANGELOG

Removed CHANGELOG entry

Updated commits UI

Closes #14633 

See merge request !4271

Get rid of Gitlab::ShellEnv

Remove obsolete code we once needed for Grack and satellites.

See merge request !4673

Resolve "Change admin navigation to match new UI"

## What does this MR do?
Moves admin navigation to layout nav to match Project, Groups, and Profile navigation

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

## Why was this MR needed?

## What are the relevant issue numbers?
Closes #18338

## Screenshots (if relevant)
![Screen_Shot_2016-06-14_at_10.26.40_AM](/uploads/f0b8c8b259da16d929be2b36e8eeafb8/Screen_Shot_2016-06-14_at_10.26.40_AM.png)
![Screen_Shot_2016-06-14_at_10.26.44_AM](/uploads/07d9ece2063dfcfec1f0f2647d8ee782/Screen_Shot_2016-06-14_at_10.26.44_AM.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 [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 !4650

Prevent default disabled buttons and links.

## What does this MR do?
Prevents default action for disabled buttons and links. If the element has `.btn` and `.disabled` at the same time, its default action will be prevented.

## Are there points in the code the reviewer needs to double check?
Yes. Is there a better way to do that?

## Why was this MR needed?
Right now we can click disabled links and it cause some troubles like in #18079.

## What are the relevant issue numbers?
Fixes #18079

## Screenshots (if relevant)
![disabled-click](/uploads/48b58ce130f843e530e62632bcc27436/disabled-click.gif)

## 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
- [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 !4658

Show number of processed MRs in milestone page

closes #14025 

![Screen_Shot_2016-05-02_at_6.20.34_PM](/uploads/9208e58c0e0c77133bd73332ee3b3342/Screen_Shot_2016-05-02_at_6.20.34_PM.png)

See merge request !4006

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add index on `requested_at` to the `members` table

See merge request !4679

Fixed issue with MR buttons being in a group

## What does this MR do?

Fixes design issue with the buttons in the merge request widget

## Screenshots (if relevant)

![Screen_Shot_2016-06-09_at_14.13.32](/uploads/44ac4175f5a97a8d7baf97be6eebc684/Screen_Shot_2016-06-09_at_14.13.32.png)


See merge request !4562

Check if the Users table has exactly one user limiting the whole set

## What does this MR do?

Limit the query set so about a full scan for all the rows on the users table (only scan to records)

#18225 

See merge request !4492

Add support for Docker Registry manifest v1

## What does this MR do?

Adds support for Manifest V1 generated by older versions of Docker (before 1.10).

## What are the relevant issue numbers?

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18609


See merge request !4669

Fixed issue with de-selecting dropdown option in issue sidebar

## What does this MR do?

When de-selecting either an assignee or milestone, we try to send `undefined` which jQuery removes from the request causing a routing error. Instead this MR sends `null` which jQuery still sends and then correctly removes either the milestone or assignee. 

## What are the relevant issue numbers?

Closes #18641 

## Screenshots (if relevant)

![assignee](/uploads/6eaca416fb6e31eabf4c038967160c07/assignee.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 [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 !4671

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

Update project star/unstar tooltip

## What does this MR do?
Fixes project toggle star button tooltip to show actual tooltip for its state.

## Are there points in the code the reviewer needs to double check?
No.

## Why was this MR needed?
- When you star a project tooltip wasn't changing.
- When you star a project and refresh the page, tooltip was still showing `Star Project`

## What are the relevant issue numbers?
Fixes #18143

## Screenshots (if relevant)

### Before 
![Screen_Shot_2016-06-15_at_15.31.57](/uploads/e005951c23eeed7c2761a0ec1911f3ce/Screen_Shot_2016-06-15_at_15.31.57.png)

### After
![tooltip-change](/uploads/4caec99eac6ffcc7331947fdfdb9e051/tooltip-change.gif)

## 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
  - [ ] 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 !4672

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Eager load project relations in IssueParser

## What does this MR do?

This changes the ReferenceParser class to eager load various associations. This in turn results in the permissions checking code (e.g. the `Ability` model) to _not_ run dozens if not hundreds of extra SQL queries depending on the amount of references involved (in a single document).

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

No.

## Why was this MR needed?

In !4410 it was revealed a _lot_ of a queries came from the `Ability` model and the code it would call. In many cases this was because the code would simply get a project, then get the owners; or get a group, then get some association of that. Eager loading these associations is a fairly simple solution and greatly cuts down the number of queries.

## What are the relevant issue numbers?

None.

## 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] ~~API support added~~
- [ ] 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)
- [ ] 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 !4675

Remove div between ul and li

## What does this MR do?
Adds `container_class`to `ul` instead of `div` for valid HTML

## What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4592#note_12420843



See merge request !4633

Award Emoji can't be awarded on system notes backend



See merge request !4668

Add environments and deployments

This MR is a continuation of https://gitlab.com/gitlab-org/gitlab-ce/issues/17009.

The current implementation is as follow:
1. We have two new tables: `environments` and `deployments`.
2. We have a new tab: `Environments` under `Pipelines` where you can see all you environments and add a new one.
3. We add a new option to `.gitlab-ci.yml` to track where we should create a deployment for environment.
4. If environment in `.gitlab-ci.yml` is specified it will create a deployment. **If environment does not exist it will be created.** (this got changed)
5. The deployment is always successful and shows the time of the action, in that case a build that presumably should do deployment. In the future we could extend deployment with statuses: success, failure. We could extend deployments with information that this is partial or full deployment.
6. User have to create environments that he will track first.
7. User can remove environments.
8. User can retry/rollback past deployment (in that case we retry past build). The new build when succeeds it will create a new deployment.
9. Currently environment have only one parameter: `name`. In the future it should have: `variables`, `credentials` and possibly `runners` and maybe other resources.
10. Currently deployment have this parameters: `sha`, `ref`, `deployable (in this case a build)`, `user (who triggered a deployment)`, `created_at`.

The `.gitlab-ci.yml`:
```
deploy to production:
  stage: deploy
  script: dpl travis...
  environment: production
```

What needs to be done:
- [x] Write initial implementation
- [x] Improve implementation (@ayufan)
- [x] Write tests (@ayufan)
- [x] Improve UX of the forms (cc @markpundsack) - reviewed by @markpundsack
- [x] Improve implementation of the views (cc @jschatz1) - done by @iamphill 
- [x] Write .gitlab-ci.yml documentation for `environments` - done by @ayufan
- [ ] Write user documentation (@ayufan and @markpundsack)

See merge request !4605

By eager loading these associations we can greatly cut down the number
of SQL queries executed when processing documents with lots of
references, especially in cases where there are references belonging to
the same project.

Since these associations are so specific to the reference parsing
process and the permissions checking process that follows it I opted to
include them directly in IssueParser instead of using something like a
scope. Once we have a need for it we can move this code to a scope or
method.