Update gray block under subnav to match other pages

## What does this MR do?
Makes Compare sub nav full width; replaces gray block with white one to match rest of pages

## What are the relevant issue numbers?
Closes #18934 

## Screenshots (if relevant)
![Screen_Shot_2016-06-21_at_1.14.46_PM](/uploads/43377efe7816b854f48966bcbd96a1cc/Screen_Shot_2016-06-21_at_1.14.46_PM.png)

cc @dzaporozhets 

See merge request !4838

Update browser gem to 2.2.0

A user with a certain browser would hit an Error 500:

```
ArgumentError: invalid value for Float(): "0."
  from browser/accept_language.rb:45:in `Float'
  from browser/accept_language.rb:45:in `quality'
  from browser/accept_language.rb:15:in `each'
  from browser/accept_language.rb:15:in `sort_by'
  from browser/accept_language.rb:15:in `parse'
  from browser/base.rb:13:in `initialize'
  from browser.rb:125:in `new'
  from browser.rb:125:in `block in new'
  from browser.rb:125:in `map'
  from browser.rb:125:in `new'
  from browser/action_controller.rb:15:in `browser'
  from abstract_controller/helpers.rb:67:in `browser'
  from app/views/layouts/_head.html.haml:38:in `_app_views_layouts__head_html_haml__1626593241142487258_59224880'
```

The root cause when the `Accept-Language` header would contain a float for the quality value (e.g. en-GB,en;q=0.v5).

Fixes https://github.com/fnando/browser/issues/241

Seen today via Sentry: https://sentry.gitlap.com/gitlab/gitlabcom/issues/7644/

See merge request !4811

Fixed private forks notice position in forks list

Moves the private forks notification item into the list on the forks page.

Closes #17671.

See merge request !4573

Move pre_process into render_result

This MR moves `Banzai::Renderer.pre_process` into `Banzai::Renderer.render_result`.

The `pre_process` method was called even when its output would be ignored. See 11a5a4f359ee57029dbfcc9185fc6b47243ea2aa for more details.

See merge request !4830

Add missing link to sidekiq metrics in API README



See merge request !4837

jQuery selector refactor in application.js.

Minor refactor for unnecessarily repeated `$(document)` `$(window)` and `$('body')`

See merge request !4809

Fixed issue with navbar counts being misaligned

## What does this MR do?

Fixes an issue in FireFox with the number counts being mis-aligned.

## What are the relevant issue numbers?

Closes #18916 

## Screenshots (if relevant)

![Screen_Shot_2016-06-21_at_15.56.51](/uploads/1d07543c14215e9e15facacc96aa3564/Screen_Shot_2016-06-21_at_15.56.51.png)

See merge request !4829

[ci skip]

Capitalize button text

Capitalizes button text to match the rest.

See merge request !4834

Fix admin appearance settings preview

Render appearance settings preview in devise layout instead of implementing it 2 times. 

See merge request !4792

Fixed hover of date picker calendar

## What does this MR do?

Fixes the hover styling of days on the datepicker dropdown in the issuable sidebar.

## Screenshots (if relevant)

![hover](/uploads/2514dc772187da33c54f8b6324202189/hover.gif)

See merge request !4786

Fixes labels view on mobile

## What does this MR do?
Fixes priority labels view on mobile

## What are the relevant issue numbers?
Fixes #18854

## Screenshots (if relevant)

<img src="/uploads/f75be3a2788858f12a63820559f20886/Screen_Shot_2016-06-20_at_2.23.26_PM.png" width="487">


See merge request !4806

Add missing import source

I realised https://gitlab.com/projects/new is missing the `gitlab export` option, while this worked fine in GDK it seems that something was missing here.

This _should_ fix it unless I'm missing any other `import_sources` (did a grep and couldn't find it anywhere else though).

See merge request !4825

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

Merge request - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4799

Align avatar and commit content within commit row

## What does this MR do?
Aligns the user avatar on `Compare`

## What are the relevant issue numbers?
Closes #18787 

## Screenshots (if relevant)
<img src="/uploads/9525a599989f6a9faca54d9f9c62f755/Screen_Shot_2016-06-20_at_11.25.08_AM.png" width="800px">
<img src="/uploads/6c96ed629f377d69745548309006a520/Screen_Shot_2016-06-20_at_11.25.19_AM.png" width="800px">


See merge request !4764

The method Banzai::Renderer.pre_process would always be called,
regardless of whether the Markdown to render was already cached or not.
In cache the document _was_ cached the output of the pre-processing
pipeline was ignored resulting in it doing nothing but wasting CPU
cycles.

This commit moves Banzai::Renderer.pre_process into
Banzai::Renderer.render_result so that it's _only_ used when needed.

Fixed issue with notification dropdown not updating active

## What does this MR do?

This fixes an issue where the notification dropdown wouldn't correctly update the selected notification type in the dropdown. I've also added a spinner to show the action is happening & removed the flash message for success.

## What are the relevant issue numbers?

Closes #18480 

## Screenshots (if relevant)

![notifications](/uploads/5ed5055d180c12450cea77543ae5f44e/notifications.gif)

See merge request !4615

Optimize Banzai::Filter::RelativeLinkFilter

See merge request !4813

Updated blank state for environments and deployments

## What does this MR do?

Adds a designed blank state to environments and deployments.

@markpundsack do we want to hide the new environments when empty? Looks weird otherwise with the green button at the top.

## What are the relevant issue numbers?

Closes #18661 

## Screenshots (if relevant)

![Screen_Shot_2016-06-21_at_09.55.03](/uploads/cf768aba3fd85a596d24b7be4fe6a6c0/Screen_Shot_2016-06-21_at_09.55.03.png)

![Screen_Shot_2016-06-21_at_09.55.10](/uploads/b7b7dba90b613cfa867b084661b36b06/Screen_Shot_2016-06-21_at_09.55.10.png)

See merge request !4818

Resolve "Tooltip for pinning sidebar"

## What does this MR do?
Adds tooltip to show whether sidebar is pinned/unpinned

## What are the relevant issue numbers?
Closes #18743 

## Screenshots (if relevant)
![Screen_Shot_2016-06-17_at_12.14.25_PM](/uploads/162f52084a770012cdc621122acd6c6c/Screen_Shot_2016-06-17_at_12.14.25_PM.png)
![Screen_Shot_2016-06-17_at_12.14.35_PM](/uploads/d9296720aeada972441f48d9a3d2f7f8/Screen_Shot_2016-06-17_at_12.14.35_PM.png)

See merge request !4759

Closes #18916

    A lot of git operations were being repeated, for example, to build a url
    you would ask if the path was a Tree, which would call a recursive routine
    in Gitlab::Git::Tree#where, then ask if the path was a Blob, which would
    call a recursive routine at Gitlab::Git::Blob#find, making reference to
    the same git objects several times. Now we call Rugged::Tree#path, which
    allows us to determine the type of the path in one pass.

    Some other minor improvement added, like saving commonly used references
    instead of calculating them each time.

Fix builds API response that did not include commit data

## What does this MR do?

This is fix for problem with builds API response not including information about commit this build is created for.

## What are the relevant issue numbers?

Closes #18476 

## 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
  - [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 !4827

Show proper image ID on registry page

## What does this MR do?
Display the container registry image ID (from the config blob) instead of the first image layer ID

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

## Why was this MR needed?
To show proper image ID on container_registry page.
This only supports manifest V2, since the manifest V1 doesn't expose information about Image ID.

## What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18159.

## Screenshots (if relevant)
![Screen_Shot_2016-06-21_at_13.16.44](/uploads/db0d3ed8c8b90fafc8dbf1644c2354b0/Screen_Shot_2016-06-21_at_13.16.44.png)

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] 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)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !4821

Allow to fetch LFS from CI

## What does this MR do?

This adds support for fetching LFS object from CI jobs (mostly it's made for supporting GitLab CI).

## What is left?

- [x] Write tests covering a new authorization mechanism

cc @grzesiek @marin

See merge request !4465

Fix of on-hover state for 'Edit' button on tree view

It's already reviewed and merged to EE, so it's just a back-port.

See merge request !4823

Cache Participable#participants in instance variable

See merge request !4803

GitLab CI Yaml template dropdown

## What does this MR do?
Make it possible to select a dropdown for an easy start with GitLab CI.

## What are the relevant issue numbers?
Closes #17521

## TODO
- [ ] Backend
  - [x] CHANGELOG item
  - [x] Fix rubocop failure
  - [x] API Support
  - [x] New tests
  - [x] Add disclaimer to the top of the gitlab-ci.yml
- [ ] Frontend
  - [x] New tests

See merge request !4411