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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

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Technically the screenshot is also out of date, but I honestly don't care enough to go through the effort of making a sample application, taking a screenshot, etc.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

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.

Upgrade Doorkeeper from 2.2.2 to 3.1.0

I’d rather upgrade one major version at a time, so Doorkeeper needs to
be upgraded to 3.x before it can be upgraded to 4.x (which includes
Rails 5 support).

Changelog:
https://github.com/doorkeeper-gem/doorkeeper/blob/master/NEWS.md#310

Working toward #14286.

See merge request !3644

Prevent Rails filtered parameters from leaking to Sentry.

As described in their Docs: https://docs.getsentry.com/on-premise/clients/ruby/integrations/rails/

See merge request !3974

Move modal css to separate file and fix danger text for confirmation modal

* in help file I found css for modal that affect whole application -> moved to separate file
* fixed ugly confirmation message when remove project
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !3979

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

Removes duplicates from the label dropdown

It concats the duplicate labels into a single label in the dropdown with the color being a gradient of the differnet colors being concatted.

I liked your idea @jschatz1 of using a standard icon color. However, with this i've taken all the duplicated colors & made a little gradient with them so it still half resembles the label colors (this has been limited to 4 or it could get crazy!)

![Screen_Shot_2016-04-28_at_10.35.04](/uploads/41f45f3f92f971e7f38df7a98765cb9d/Screen_Shot_2016-04-28_at_10.35.04.png)

Closes #16555, #14820

See merge request !3963

Updated spacing between notification label and button

![Screen_Shot_2016-04-28_at_11.36.26](/uploads/7b33e78e85688d96f878272ee93038ba/Screen_Shot_2016-04-28_at_11.36.26.png)

Closes #16552

See merge request !3965

It concats the duplicate labels into a single label in the dropdown with
the color being a gradient of the differnet colors being concatted.

Closes #16555

AwardsHandler follows code style conventions



See merge request !3871

Closes #15527.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Support supressing text file diffs on the default branch with .gitattributes

This change allows users to suppress diffs for text files by adding an entry to the `.gitattributes` file. To take effect the file present at the HEAD of the default branch.

When rendering a diff, if the file is text according to the charlock holmes gem (via the `text?` method) but the file is not diffable according to the project repository, then a message is displayed stating that the diff was suppressed.

![image](/uploads/2e119b725875a301e30d9ad482e283b3/image.png)

I looked into ways to do this using a `binary` flag as suggested by @stanhu in [this comment](https://gitlab.com/gitlab-org/gitlab-ce/issues/2315#note_4435454), however, there was no good way to seperate what was a real binary file from one that had been marked as not diffable in `.gitattributes`.

Fixes and closes gitlab-org/gitlab-ce#2315.

See merge request !3806

This is a combination of 3 commits.

- Update the bare repositories info/attributes if the default branch is updated
- Check the diff attributes of a file before showing a diff
- Update CHANGELOG

Remove deprecated CI badge helper

Closes #13446

See merge request !3977

Use a better message when milestone is newly created

closes #14982

See merge request !3925

Fixed CHANGELOG for 8.7.1/8.7.2

See merge request !3978

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