Use sign out path only if not empty

Fixes: https://github.com/gitlabhq/gitlabhq/issues/10066

See merge request !3989

Update rspec-rails from 3.3.3 to 3.4.2.

This allows the removal of the monkey patch from this commit: 47ff1c56

It'll also make it slightly easier to upgrade to 3.5.0 later.

Changelog: https://github.com/rspec/rspec-rails/blob/master/Changelog.md#340--2015-11-11

See merge request !3999

Link to GitLab code review guide in contributing guidelines

I noticed that the contributing guidelines still link to the thoughtbot
code review guidelines even though we already have our own.

[ci skip]

See merge request !4018

Improve the Two-factor Authentication sign-in text [ci skip]

Resolves #14543.

See merge request !3483

Resolves #14543.

Add clear instructions on installing the pg_trgm extension

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/17191

See merge request !4025

[ci skip]

Added performance guidelines

Fixes #15254 #14277

See merge request !3303

[ci skip]

Updated CHANGELOG for 8.7.2

See merge request !4021

[ci skip]

[ci skip]

I noticed that the contributing guidelines still link to the thoughtbot
code review guidelines even though we already have our own.

[ci skip]

[ci skip]

Support e-mail notifications for comments on project snippets

While working with project snippets recently, I noticed that notifications would not be sent out for comments on notes. This MR fixes this.

Note: I'm not completely sure why `ProjectSnippets#participants` returns an empty array if you don't include the concern that is already in `Snippets` but didn't dig into it any more.

Closes #2334

See merge request !3987

Closes #2334

Fix error when trying to create a wiki page

Closes #15527, #15569, #15623, #15630, #15637, #15653, #15870, #16558, #16875, #16987, #17016, https://github.com/gitlabhq/gitlabhq/issues/10317.

See merge request !3924

Fix "remember me" sign in option

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/4006

Prior to this change, 'remember me' was effectively always on because
the `_gitlab_session` cookie was always made persistent. With this
change it becomes possible again to have `_gitlab_session`be a session
cookie when 'remember me' is unchecked.

See merge request !4004

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

Remove duplicate entry in the CHANGELOG

[ci skip]

See merge request !4002

Backported minimal safewebhook implementation to GitLab CE

This brings a minimal implementation for gitlab-org/gitlab-ce#13478
backported from EE (gitlab-org/gitlab-ee!334).

Also added UI to configure Secret Token

Fixes #15365.

See merge request !3940

Codestyle changes to easy EE merge

This allows the removal of the monkey patch from this commit: 47ff1c56

It'll also make it slightly easier to upgrade to 3.5.0 later.

Changelog: https://github.com/rspec/rspec-rails/blob/master/Changelog.md#340--2015-11-11

Fix the GitHub Omniauth instructions

Technically the screenshot is also out of date, but I honestly don't care enough to go through the effort of making a sample application, taking a screenshot, etc.

See merge request !3976

Handle issue move access instead of raising error

Closes #15533

See merge request !3990

Closes #15533

Add more parameters to the filter_parameters config.

Adds Sentry DSN, Webhooks, Deploy Keys, etc.

Alphabetized the parameters and included line breaks between each parameter. Easier to merge into EE if there are any differences.

This also seems to be the more popular syntax for adding new parameters, from what I can find.

In the future we may want to [increase the specificity of some of these](http://blog.bigbinary.com/2016/03/07/parameter-filtering-enhacement-rails-5.html) once Rails 5 is out. e.g. instead of `:hook`, `"hook.url"` would be just as effective without removing potentially useful information from the logs.

cc: @stanhu 

See merge request !3971

Adds Sentry DSN, Webhooks, Deploy Keys, etc.

Alphabetized the parameters and included line breaks between each parameter. Easier to merge into EE if there are any differences.

This also seems to be the more popular syntax for adding new parameters, from what I can find.

Fixes gitlab-org/gitlab-ce#15254 gitlab-org/gitlab-ce#14277

[ci skip]

Cleaned up/tweaked Project#open_branches

See commit c825404572040a3a45cb9e2b3d3e7d64900f66c9 for the details of the changes and https://gitlab.com/gitlab-org/gitlab-ce/issues/14280#note_4973648 for more information.

See merge request !3985

This changes 4 things:

1. Project#protected_branches_names has been renamed to
   Project#protected_branch_names.

2. Project#open_branches uses a Set for the branch names as checking
   values in a Set is faster than checking values in a (large) Array.

3. Some redundant code in Project#open_branches has been removed.

4. Project#protected_branch_names now uses #pluck instead of #map,
   removing the need for loading entire DB records into memory.

Fix some broken links in the documentation [ci skip]

cc: @dblessing @axil 

See merge request !3982

This changes Project#protected_branch? to use a query to check if a
branch is protected, instead of loading all ProtectedBranch records into
memory just to check if the list of names includes a given branch name.