disable markdown in comments when referencing disabled features

fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/23548

This MR prevents the following references when tool is disabled:

- issues
- snippets
- commits - when repo is disabled
- commit range - when repo is disabled
- milestones

This MR does not prevent references to repository files, since they are just markdown links and don't leak
information.

See merge request !2011
Signed-off-by: NRémy Coutable <remy@rymai.me>

Honour issue and merge request visibility in their respective finders

This MR fixes a security issue with the IssuesFinder and MergeRequestFinder where they would return items the user did not have permission to see. This was most visible on the issue and merge requests page for a group containing projects that had set their issues or merge requests to "private".

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/22481

See merge request !2000

24146 Add focus state to buttons and dropdowns

## What does this MR do?
Adds focus state to buttons and dropdowns

## Are there points in the code the reviewer needs to double check?
All focus states of buttons and dropdowns :)

## Why was this MR needed?
Improve accessibility

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-11-07_at_4.30.31_PM](/uploads/8db2ac5e225c78495797180faf7bdb28/Screen_Shot_2016-11-07_at_4.30.31_PM.png)
After:
![Screen_Shot_2016-11-07_at_4.30.16_PM](/uploads/4a81810cafe3063eef02b7bc87f8ce69/Screen_Shot_2016-11-07_at_4.30.16_PM.png)

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) 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 it does - 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 #24146

See merge request !7347

Bring back the old JIRA docs

## What does this MR do?

Bring back the old JIRA docs

## Why was this MR needed?

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6598 introduced new
JIRA settings, but that's not yet released. Since our documentation is currently
built using the master branch, users are having issues where the docs show
different settings than what GitLab's latest stable release supports.

## What are the relevant issue numbers?

https://gitlab.zendesk.com/agent/tickets/48003

See merge request !7365

Improved build page scroll UX

## What does this MR do?

This MR smoothes the UX of the builds page by more effectively affixing the scroll step buttons.

It also ensures the scroll step buttons are always in view, even if the sidemenu is open.

It also moves the autoscroll button into the same container as the scroll buttons.

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

## Why was this MR needed?

The build scroll buttons are always in unpredictable places and are often hidden behind sidemenus.

## Screenshots (if relevant)

![2016-09-08_17.43.58](/uploads/49cb9ad5ef2764453afaa405af7111b2/2016-09-08_17.43.58.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
- [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?

Contributes #21832

See merge request !6270

https://gitlab.zendesk.com/agent/tickets/48003

[ci skip]

Replace jQuery.timeago with timeago.js

## What does this MR do?
Replaces jQuery.timeago with [timeago.js](https://github.com/hustcc/timeago.js)

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

*  Check to make sure its working everywhere 😄 
*  Check to make sure the timeago wording matches what we have now (I think I've got this down but an extra pair of 👀 would help too)

## Why was this MR needed?

*  The jQuery.timeago version we have is outdated
*  timeago.js is smaller (7.19 KB => 4.52 KB)
* timeago.js has no jQuery dependency
* removes all inline javascript ⚔  for timeago

## Screenshots (if relevant)
None

## 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 #21793

See merge request !6274

Document the usage of the Docker OverlayFS driver

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/21596

See merge request !7361

Apply `*_params_ce` pattern to ProjectsController

See merge request !7338

Clicking "force remove source branch" label now toggles the checkbox again

We remove the ID from the hidden tag for `merge_request[force_remove_source_branch]`
in order to fix the checkbox toggling when the associated label is clicked.

The issue was introduced by !7267 and discovered in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7267#note_18028311.

See merge request !7356

[ci skip]

Faster search inside Project

See merge request !7353

Fix new branch button spec

Closes #24089.

See merge request !7284

Refactor routing constraints

## What does this MR do?

Refactors routing constraints

## Why was this MR needed?

This refactoring make it possible to introduce nesting namespaces and project constrainer in future. 

## What are the relevant issue numbers?

Extracted from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7121/

See merge request !7327

Fix broken commits search

## What does this MR do?

Fixes commits search



## What are the relevant issue numbers?


Closes #24255

See merge request !7339

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

Move Ajax interceptor into describe block

## What does this MR do?

Move registering the Vue resource interceptor for issue board mock data into the corresponding `describe` blocks.

## Why was this MR needed?

Currently, the interceptor is registered for every test (which makes them at best fail for Ajax calls using Vue resource).

See merge request !7304

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

Refactor project routing

## What does this MR do?

Refactor project routing: 

* split on multiple files
* improve routing order


## Why was this MR needed?

It makes it easier to maintain and modify project routing

## What are the relevant issue numbers?

Extracted from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7121

See merge request !7329

Refactor namespace regex

Reuse existing namespace regex constant in routing

See merge request !7336

Set default Sidekiq retries to 3

See merge request !7294

Refactor group routing

## What does this MR do?

Refactor group routing: 
* separate controller actions from nested resources
* prepare group routing for nested namespaces support

## Why was this MR needed?

So when we introduce nested groups support we need to only change `:id` to `*id`

## What are the relevant issue numbers?

Extracted from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7121

See merge request !7328

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

Bump omniauth-gitlab to 1.0.2 to fix incompatibility with omniauth-oauth2

As noted in gitlab-com/support-forum#1270, omniauth-gitlab fails if omniauth-oauth2 is bumped to 1.4.0, OAuth2 quietly fails due to https://github.com/linchus/omniauth-gitlab/issues/10:

```
21:26:04 rails-web.1             | I, [2016-11-07T21:26:04.245007 #56637]  INFO -- omniauth: (gitlab) Callback phase initiated.
21:26:05 rails-web.1             | E, [2016-11-07T21:26:05.068009 #56637] ERROR -- omniauth: (gitlab) Authentication failure! invalid_credentials: OAuth2::Error, invalid_grant: The provided authorization grant is invalid, expired, revoked, does not match the redirection URI used in the authorization request, or was issued to another client.
```

This was fixed and discussed here: 
* https://github.com/linchus/omniauth-gitlab/commit/26c47e55396205fab8439363c98136d0fde797f3
* https://github.com/linchus/omniauth-gitlab/issues/10

Bumping this version to 1.0.2 will ensure future compatibility.

See merge request !7348

Use separate email-friendly token for incoming email

See merge request !5914

Fixed todos empty state when filtering

Closes #24127

See merge request !7334

Fix project index page

See merge request !7331

API: Return 400 when creating a systemhook fails

Closes #23335

See merge request !7350

Network page appear with an error message when entering nonexistent git revision

Closes #2362

See merge request !7172

Moved if statements around in view

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

Closes gitlab-com/support-forum#1270

Replace trigger with the new ID of the docs project

Now that the old docs site is deprecated in
favor of https://gitlab.com/gitlab-com/gitlab-docs

See merge request !7343

[ci skip]

17492 Update link color for more accessible contrast

## What does this MR do?
Improves contrast of links to pass accessibility contrast checker http://webaim.org/resources/contrastchecker/

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-11-07_at_11.09.44_AM](/uploads/233c53cd81436a00f0cc7f826ca900df/Screen_Shot_2016-11-07_at_11.09.44_AM.png)
After:
![Screen_Shot_2016-11-07_at_11.09.22_AM](/uploads/698ac990d61434893709a3cea78896d9/Screen_Shot_2016-11-07_at_11.09.22_AM.png)

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) 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 it does - 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 #17492

See merge request !7340