This MR adds support for the `token` attribute in the project hook API.

Feature requested on a dependant project: https://github.com/gpocentek/python-gitlab/issues/170

See merge request !7220

Added guide for upgrading Postgres using Slony

## What does this MR do?

This adds a guide for upgrading PostgreSQL using Slony.

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

Spelling, grammar, etc

## Why was this MR needed?

This process is not documented and we'll need to provide steps on how to do this before we start shipping PostgreSQL 9.6 with omnibus-gitlab.

## 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] 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)

cc @pcarranza @marin @axil

See merge request !6711

Milestone dropdown does not stay selected

Closes #23713

See merge request !7117

Add Rake task to create/repair GitLab Shell hooks symlinks

## What does this MR do?

Adds a Rake task wrapper around `gitlab-shell` `bin/create_hooks` script. This makes it easier for an administrator to repair hooks symlinks without worrying about where repository data is located, etc. Just run this task and it takes care of everything based on current configuration. 

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

No.

## Why was this MR needed?

`bin/create_hooks` was not well-documented. It requires parameters specifying where repository data is located. It also needs to be run by the `git` user. Wrapping it in a Rake task allows us to take current configuration in to account and makes it easier on the administrator. 


See merge request !5634

Allow owners to fetch source code in CI builds

Due to different way of handling owners of a project, they were not allowed to fetch CI sources for project.

This adds a separate code path for handling owners, that are not admins.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/23437

See merge request !6943

Remove invalid changelog entries

Fixes current CHANGELOG.md in master

See merge request !7231

Resolve "Tables pagination is not responsive"

## What does this MR do?
Makes table pagination responsive.

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

## Why was this MR needed?
Table pagination was not responsive and was broken in smaller screens

## Screenshots (if relevant)
### Small screen
![small](/uploads/912c6813596ef9f992b3bf5a9ba141f1/small.png)
![small_big_numbers](/uploads/5add4c2ead1bd3fbf9f15f66e2dad178/small_big_numbers.png)

### Medium screen
![medium](/uploads/77774be45d83ad9bba127d0e020e2d48/medium.png)

### Large screen
![big](/uploads/ea30d115e7e2b915626faafa425687f6/big.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) 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
  - [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 it does - 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 #23053

See merge request !7157

Resolve "Improve build "Retry" button on Build Page"

* On desktop, adds retry button on build page header
* On mobile, adds retry button in sidebar

![Screen_Shot_2016-10-28_at_1.35.07_PM](/uploads/2f9f87a9fc3e85c9aafc8c3d7a231639/Screen_Shot_2016-10-28_at_1.35.07_PM.png)
![Screen_Shot_2016-10-26_at_1.01.44_PM](/uploads/d02ce3a422a505b14ab357f695de8bba/Screen_Shot_2016-10-26_at_1.01.44_PM.png)

Closes #23273

See merge request !7126

23545 Fix distorted project and group avatars

## What does this MR do?
Wraps project and group avatars in image container to prevent distortion

## Are there points in the code the reviewer needs to double check?
- Group/project lists
- Group/project pages
- Group/project admin pages
- Group/project edit pages

## Screenshots (if relevant)

### Before
![Screen_Shot_2016-10-31_at_12.35.42_PM](/uploads/abaeef7ded89abbba7e08be686c9a609/Screen_Shot_2016-10-31_at_12.35.42_PM.png)

### After
![Screen_Shot_2016-10-31_at_12.35.28_PM](/uploads/cafe1b096cf66afde7f346e5610bf3f3/Screen_Shot_2016-10-31_at_12.35.28_PM.png)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) 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
- [ ] 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 #23545

See merge request !7206

Because this code resides in lib/ it may be eager loaded. Rails in turn
doesn't define Rails::Generators by default unless you explicitly
require "rails/generators".

Fixed anchoring diff lines in collapsed diffs

## What does this MR do?

This MR adds the ability to `forceLoad` a collapsed diff from instantiation, on top of this, if it is force loaded, we can pass a callback function to be invoked when the content is loaded.

Now when a MR is loaded, we check for a diff line anchor that is currently within a collapsed diff, we re-instantiate the `singleFileDiff` with the `forceLoad` option. We also pass a callback function that in responsible for highlighting and scrolling to the specified anchor.

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

## Why was this MR needed?

We currently cannot anchor link to collapsed diff lines as the do not auto-expand.

## Screenshots (if relevant)

https://youtu.be/fZVLlP6kchw

## 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
- [ ] 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 you do - 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 #21633

See merge request !6285

Update links in side nav and header

* Remove todos, help, and project settings from sidebar
* Remove plus icon from top right header
* Put help link in user dropdown
* Add lighter bg-color at the top of side nav

![Screen_Shot_2016-10-27_at_3.42.55_PM](/uploads/d81f3135b1af1e580d62451ae83b3435/Screen_Shot_2016-10-27_at_3.42.55_PM.png) 
Closes #22889

See merge request !7161

Support for post deployment migrations

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/22133

See merge request !6572

Adds label description to issue board title

## What does this MR do?

Adds the label description as a tooltip the issue board title. Tooltip is not visible on the backlog or done list.

## Screenshots (if relevant)

![tooltip-title](/uploads/e807a7ff6c48ac2181c4d4e86adf0f77/tooltip-title.gif)

## What are the relevant issue numbers?

Closes #22710

See merge request !6743

Hide project activity tabs when features are disabled

## What does this MR do?

When features are disabled in project settings, the activity tabs are now correctly hidden.

## Screenshots (if relevant)

![Screen_Shot_2016-10-21_at_12.15.27](/uploads/3d85c027aa05487001c8abd624a99be0/Screen_Shot_2016-10-21_at_12.15.27.png)

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/19734#note_17224181

See merge request !7038

Remove tooltips from project header

Closes #23641

See merge request !7211

Fixes changelog

fix how to get SAML error details

## What does this MR do?

Update to better document how to get SAML error details.

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/1929 and https://gitlab.com/gitlab-org/gitlab-ce/issues/3223. Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/12705.

See merge request !7199

Initialize Sidekiq with the list of queues used by GitLab

See merge request !7217

Add validation errors to Merge Request form

Closes #22448

See merge request !7163

Media queries for medium screens

Adds entry to CHANGELOG

Rollback to previous design

Adds class for previous sibling

Fix removed class

Fixes after review

Fix scss linter

Allow admin to search for user by secondary email address

Closes #23761

See merge request !7115