Resolve "Destroying a project causes post_decline_request to be executed"

## What does this MR do?

Ensure we don't send "access request declined" to access requesters when a project is deleted.

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

I've created a service to decouple the notification sending from the AR model.

## Why was this MR needed?

Because there was an issue.

## What are the relevant issue numbers?

Fixes #18755, #18750.

## Does this MR meet the acceptance criteria?

- [x] No CHANGELOG needed.
- [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 !4744

Update mail_room to 0.8.0 to resolve #13357

Update mail_room to 0.8.0 to resolve #13357

Which includes the fix from:
https://github.com/tpitale/mail_room/pull/73

See merge request !4835

Resolve "Graphs and Wiki subnav"

## What does this MR do?
Styles sub nav in `Wiki` and `Graphs`

## What are the relevant issue numbers?
Closes #18533 

## Screenshots (if relevant)
![Screen_Shot_2016-06-15_at_9.32.43_AM](/uploads/111dae6e1b9c7d8038ac88b9be6f76a2/Screen_Shot_2016-06-15_at_9.32.43_AM.png)

cc @dzaporozhets 

See merge request !4678

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

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

Rename Code tab to Repository

As discussed in #18830, this renames the "Code" tab to "Repository".

Screenshot now:

![image](/uploads/a7807dfb5b42f037fe2a44475a4af883/image.png)


See merge request !4807

Apply responsive design for Contributors graphs.

## What does this MR do?

Makes the Contributors graphs work on mobile.

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

That this doesn't break on any screen sizes.

## Why was this MR needed?

It used to be squished and impossible to read.

## What are the relevant issue numbers?

Fixes #18845.

## Screenshots (if relevant)

Before:

![Screen_Shot_2016-06-18_at_1.00.58_PM](/uploads/bc17df5dabed0085c8ffdca303a502a5/Screen_Shot_2016-06-18_at_1.00.58_PM.png)

After:

![Screen_Shot_2016-06-20_at_9.21.03_AM](/uploads/a0307cb255646800d0e4c8647769f7b6/Screen_Shot_2016-06-20_at_9.21.03_AM.png)

cc: @jschatz1 

See merge request !4801

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]

Which includes the fix from:
https://github.com/tpitale/mail_room/pull/73

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