Resolve "Sub nav isn't showing on file view"

## What does this MR do?
Adds subnav to `Repository` > `File` view

## What are the relevant issue numbers?
Closes #19003 
Part of #18844 

## Screenshots (if relevant)
![Screen_Shot_2016-06-23_at_5.33.05_PM](/uploads/aa6993b2376dbe454af87d852aa74f5e/Screen_Shot_2016-06-23_at_5.33.05_PM.png)

cc @dzaporozhets 

See merge request !4890

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

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

File Browser navigation fixes

Fixes a double request being made when clicking the file name when navigating through file browser and also fixes opening a file in a new tab or when doing ctrl + click.

Closes #19050

**Before**

![navigation-old](/uploads/f9a40c91e430e31beae3a896cffb1c68/navigation-old.gif)

**After**

![navigation](/uploads/dec9b43894c00cc09d80d19c83506530/navigation.gif)


See merge request !4891

Fixed 'use shortcuts' button on docs

## What does this MR do?

Exposes 'onToggleHelp() to window object through `showHelp()` so a help panel can be toggled globally using `showHelp()`.

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

Is this the best implementation? I actually think this is tidier than doing something like `onclick="new Shortcuts().onToggleHelp"` or `$.trigger 'keydown', char: '?'` but let me know.

## Why was this MR needed?

Docs UX

## What are the relevant issue numbers?

Closes #19157.

## 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
- [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)
Closes #19157

See merge request !4979

Align flash messages with left side of page content

## What does this MR do?

- align flash messages with left side of page content

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

- flash messages in general

## Why was this MR needed?

- flash messages didn't fit new design

## What are the relevant issue numbers?

closes  #18688

## Screenshots

# Before

![failed-login](/uploads/fb57d288fb7ae775cc0b8dbb0c7b6af2/failed-login.png)

---

![explore-blocked-account](/uploads/aa6d5ff74a4c9ed29ed361f2ffdf5c8e/explore-blocked-account.png)

---

![project-blocked-account](/uploads/4f36118f5438d661ea202b180bf9cb8d/project-blocked-account.png)

---

![issue-blocked-account](/uploads/68e87385ec30952797dc5c1f8f36216d/issue-blocked-account.png)

---

![inline-flash](/uploads/c0aba047f90d56001265e37ba9751e19/inline-flash.png)

---

# After

![failed-login](/uploads/d45d2d832a16af8e1854f1832e7b87a4/failed-login.png)

---

![blocked-account](/uploads/ddcd3d23569ded403700c01934df61df/blocked-account.png)

---

![project-blocked-account](/uploads/9e286c3b95f70cae1819930a09cc1307/project-blocked-account.png)

---

![issue-blocked-account](/uploads/4fde8e770eab0dae03b25e1402f171a1/issue-blocked-account.png)

---

The left padding will be fixed by  !4854

![inline-flash](/uploads/081b824b99d8ca65d67e9d15778a991d/inline-flash.png)

---

![flash-dismissed](/uploads/641e6227050de22e0df9a85ffca4ced1/flash-dismissed.png)

See merge request !4959

Removed from window and used static method

Fix database migrations when Redis is not running

If Redis were not running or USE_DB were set to false, the application settings retrieval would fail completely. This change only attempts to use the cache if the system actually
wants to connect to the DB and rescues any failures in talking to Redis.

Closes #17557 


See merge request !4924

This fixes the double request being made to the same URL

Update `Gitlab.com?` to support staging

Ref: https://gitlab.com/gitlab-com/operations/issues/324#note_12428337

See merge request !4637

Memoize the maximum access level for the author of notes

Cache the maximum access level for each user in a map in the controller
    
In #19273, we saw that retrieving ProjectTeam#human_max_access for each note takes the bulk of the time when rendering certain issues or merge requests. We observe that most of the comments in an issue are typically done by the same users. This MR memoizes the max access level by user ID.

See merge request !4982

Adds focus state style to markdown area buttons.

## What does this MR do?

It makes it possible to see when the button is focused when tabbing through the interface. This is for the new markdown buttons in the comment field.

See merge request !4867

Fixed URL on label button when filtering

## What does this MR do?

Gives the filtered labels the correct URL. Previously they tried to link to `labels#show` whereas now it links to the correct filter path.

## What are the relevant issue numbers?

Closes #19005 


See merge request !4897

Fixed comit avatar alignment

## What does this MR do?

Fixes the alignment of the avatar on https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG

Also fixes potential issues in other places.

## Screenshots (if relevant)

![Screen_Shot_2016-06-27_at_10.58.26](/uploads/fa4f50cfc30a870422d1afa63a4331d1/Screen_Shot_2016-06-27_at_10.58.26.png)![Screen_Shot_2016-06-27_at_10.58.35](/uploads/bd7dc3cf77464c1775fabb45b8079f02/Screen_Shot_2016-06-27_at_10.58.35.png)

See merge request !4933

Disabled native autocomplete for dropdown filter inputs

## What does this MR do?

Disables native autocomplete for the dropdown filter inputs.

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

Did we want this on all dropdown filter inputs? The issue specifies only the 'label' filter input but I think it is relevant for any filter input?

## Why was this MR needed?

No need for native autocomplete.

## What are the relevant issue numbers?

Closes #19184

## 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
- [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 !4974

If Redis were not running or USE_DB were set to false, the
application settings retrieval would fail completely. This
change only attempts to use the cache if the system actually
wants to connect to the DB and rescues any failures in talking to
Redis.

Closes #17557

Enable Style/SpaceAfterComma and Colon Rubocop cops

See #17478

See merge request !4991

Added RuboCop cops for checking DB migrations

See merge request !4906

[ci skip]

[ci skip]

Insert notification settings dropdown into groups

## Display notification settings dropdown for groups

part of #3359   

![groups](/uploads/d61648236b81b0cca55fa2d73758f0df/groups.png)
![Screenshot_from_2016-06-29_10-58-37](/uploads/7be05ea6002932c094a81b25a308fd62/Screenshot_from_2016-06-29_10-58-37.png)  
![small](/uploads/6f2b556d734c870e358f6f56618a0bab/small.png)

See merge request !4857

Fixed search field blur not removing focus

## What does this MR do?

Adds a blur event to remove focus styling from the search input.

Any particular reason we were looking for clicks on the document? I can't see why we would be.

## What are the relevant issue numbers?

Closes #18670 

## Screenshots (if relevant)

![tab](/uploads/4c74d4f76ec7b45bfcf581606d2defb5/tab.gif)

See merge request !4704

optimize png images losslessly using zopflipng

Resend https://github.com/gitlabhq/gitlabhq/pull/10354#issuecomment-222194091

Optimized 246 png images losslessly using Google's zopflipng.
```
 app/assets/images/auth_buttons/azure_64.png        | Bin 986 -> 695 bytes
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 app/assets/images/gitlab_logo.png                  | Bin 5189 -> 3616 bytes
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 doc/workflow/img/web_editor_new_push_widget.png    | Bin 11220 -> 7076 bytes
 doc/workflow/img/web_editor_new_tag_dropdown.png   | Bin 33753 -> 20080 bytes
 doc/workflow/img/web_editor_new_tag_page.png       | Bin 75536 -> 36610 bytes
 .../img/web_editor_start_new_merge_request.png     | Bin 14352 -> 8596 bytes
 doc/workflow/img/web_editor_upload_file_dialog.png | Bin 46219 -> 21502 bytes
 .../img/web_editor_upload_file_dropdown.png        | Bin 34835 -> 20651 bytes
 .../bitbucket_import_select_project.png            | Bin 16121 -> 15288 bytes
 .../fogbugz_importer/fogbugz_import_finished.png   | Bin 53276 -> 30266 bytes
 .../fogbugz_importer/fogbugz_import_login.png      | Bin 44444 -> 20797 bytes
 .../fogbugz_import_select_fogbogz.png              | Bin 35415 -> 20526 bytes
 .../fogbugz_import_select_project.png              | Bin 62552 -> 34836 bytes
 .../fogbugz_importer/fogbugz_import_user_map.png   | Bin 157856 -> 77208 bytes
 .../importing/gitlab_importer/importer.png         | Bin 40778 -> 18366 bytes
 .../importing/gitlab_importer/new_project_page.png | Bin 72663 -> 33589 bytes
 .../img/import_projects_from_github_importer.png   | Bin 28033 -> 22711 bytes
 ...mport_projects_from_github_new_project_page.png | Bin 17225 -> 13668 bytes
 doc/workflow/merge_commits.png                     | Bin 41422 -> 22181 bytes
 doc/workflow/merge_request.png                     | Bin 169503 -> 98070 bytes
 doc/workflow/merge_requests/commit_compare.png     | Bin 110376 -> 65010 bytes
 doc/workflow/merge_requests/merge_request_diff.png | Bin 166226 -> 103239 bytes
 .../merge_request_diff_without_whitespace.png      | Bin 121476 -> 71896 bytes
 doc/workflow/merge_when_build_succeeds/enable.png  | Bin 151112 -> 68769 bytes
 doc/workflow/merge_when_build_succeeds/status.png  | Bin 180318 -> 82655 bytes
 doc/workflow/messy_flow.png                        | Bin 33829 -> 19314 bytes
 doc/workflow/milestones/form.png                   | Bin 88591 -> 84872 bytes
 doc/workflow/milestones/group_form.png             | Bin 77087 -> 74429 bytes
 doc/workflow/mr_inline_comments.png                | Bin 193311 -> 117313 bytes
 doc/workflow/notifications/settings.png            | Bin 90986 -> 59256 bytes
 doc/workflow/production_branch.png                 | Bin 21716 -> 10946 bytes
 .../protected_branches/protected_branches1.png     | Bin 170113 -> 155815 bytes
 .../protected_branches/protected_branches2.png     | Bin 25851 -> 23208 bytes
 doc/workflow/rebase.png                            | Bin 123041 -> 68976 bytes
 doc/workflow/release_branches.png                  | Bin 44173 -> 22163 bytes
 doc/workflow/releases/new_tag.png                  | Bin 154755 -> 87330 bytes
 doc/workflow/releases/tags.png                     | Bin 165449 -> 93016 bytes
 doc/workflow/remove_checkbox.png                   | Bin 22272 -> 12339 bytes
 doc/workflow/share_with_group.png                  | Bin 53784 -> 50450 bytes
 doc/workflow/shortcuts.png                         | Bin 108255 -> 108209 bytes
 .../wip_merge_requests/blocked_accept_button.png   | Bin 65231 -> 32720 bytes
 doc/workflow/wip_merge_requests/mark_as_wip.png    | Bin 41549 -> 21640 bytes
 doc/workflow/wip_merge_requests/unmark_as_wip.png  | Bin 32151 -> 16606 bytes
 public/apple-touch-icon-precomposed.png            | Bin 11097 -> 9509 bytes
 public/apple-touch-icon.png                        | Bin 11097 -> 9509 bytes
 spec/fixtures/dk.png                               | Bin 1143 -> 1062 bytes
```

cc @connorshea

See merge request !4325

Changes calendar activities to use target reference

## What does this MR do?

Uses the targets reference in the calendar activities list. Previously it was using `#` which is wrong for merge requests.

## Screenshots (if relevant)

![Screen_Shot_2016-06-29_at_14.29.08](/uploads/4c52bbc7ca68d7b25e5bfb11ea55eef7/Screen_Shot_2016-06-29_at_14.29.08.png)

See merge request !4992

In #19273, we saw that retrieving ProjectTeam#human_max_access for each
note takes the bulk of the time when rendering certain issues or merge requests.
We observe that most of the comments in an issue are typically done by the
same users. This MR memoizes the max access level by user ID.