Updated gitlab-shell to 2.7

This is done to include the changes introduced in
https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/42.

See merge request !3437

This is done to include the changes introduced in
https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/42.

Use raw SQL instead of Rails models in migrations where appropriate

Closes #14694.

See merge request !3429

Fix order of steps to prevent PostgreSQL errors when running migration

Supersedes https://github.com/gitlabhq/gitlabhq/pull/10100.

/cc @stanhu @rodrigomanhaes

See merge request !3355

Fix error when visiting CI root path

Closes #14528, closes #14687

See merge request !3377

Remove tabstop from the WIP toggle links

[ci skip]

See merge request !3426

Ensure private project snippets are not viewable by unauthorized people

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14607

See merge request !1946

Fix dropdown line height

**Before**

![Screen_Shot_2016-03-28_at_5.54.37_PM](/uploads/67681da80b9104924083f13af3833553/Screen_Shot_2016-03-28_at_5.54.37_PM.png)

**After**

![Screen_Shot_2016-03-28_at_5.57.37_PM](/uploads/5df14c2d131cc88dbc75b87959f56c3c/Screen_Shot_2016-03-28_at_5.57.37_PM.png)


See merge request !3431

Fix right sidebar overlapping build section in merge request

closes #14608 

![build](/uploads/d1902f5fa335274c92ac1b1a8193466f/build.gif)


See merge request !3415

Closes #14694.

Add link to forks pages in fork counter button

closes #14412 

![fork_link](/uploads/5afef05bc592b0cf1c90ae4d154aed87/fork_link.gif)

See merge request !3387

[ci skip]

Updates sidebar to use new dropdowns for issues and merge requests

Fixes #12935, #13164 

See merge request !3175

Fix background when editing a highlighted note

Fixes #14643 

See merge request !3423

Fixes note's action bar background color when note is highlighted

Update github.md

Small ui fixes

- Dont use small font size for commits list    
- Use standard button size for new file
- Fix vertical align for files tab top navigation
- Add border bottom and margin for readme holder 


cc @skyruler @jschatz1 

See merge request !3419

Update ldap docs

Related to gitlab-org/gitlab-ee#397

@axil What do you think of moving LDAP configuration docs to `adminstration/auth/ldap.md`? Then we'll probably need to add the relevant group link configuration piece to some user group documentation. We can cross-link and deprecate the current `integration/ldap.md` location.

See merge request !3336

Back dating of issues when creating through the API

Closes #12628 

See merge request !3408

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

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

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

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

Fix cancel button on issuables

Fixes #14671

See merge request !3417

Upgrade web-console to 2.3.0

Rails 5 compatibility release.

[See the Changelog for more information](https://github.com/rails/web-console/releases/tag/v2.3.0).

Working towards #14286.

See merge request !3400

Upgrade font-awesome-rails to 4.5.0.1

Includes Rails 5 support.

[See Changelog for details](https://github.com/bokmann/font-awesome-rails/releases/tag/v4.5.0.1).

Working towards #14286.

See merge request !3399

Upgrade Brakeman from 3.1.4 to 3.2.1

Includes support for Rails 5, bug fixes, and various additional vulnerability checks.

[See Changelog for more information](https://github.com/presidentbeef/brakeman/blob/master/CHANGES).

Working towards #14286.

See merge request !3397

Upgrade Teaspoon from 1.0.1 to 1.1.5.

Includes compatibility with Rails 5.

See the changelog for more information (https://github.com/modeset/teaspoon/blob/master/CHANGELOG.md).

Working towards #14286.

See merge request !3409

Upgrade Bullet to 5.0.0

Includes Rails 5 support.

[See changelog for details](https://github.com/flyerhzm/bullet/blob/master/CHANGELOG.md).

Working towards #14286.

See merge request !3396

Fix typos in webhooks docs



See merge request !3416

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/14660

Don't attempt to look up an avatar in repo if repo directory does not exist

Relates to https://sentry.gitlap.com/gitlab/gitlabcom/issues/3507/

Closes #14580



See merge request !3390