Rename ENV['PROTOCOL'] to ENV['GL_PROTOCOL'] to conform to what GitLab Shell expects and make the `protocol` param in `GitAccess` mandatory.

Instrument Rinku usage

## What does this MR do?

Add metrics instrumentation to Rinku, module methods (autolink)

## What are the relevant issue numbers?

#18593 

## Does this MR meet the acceptance criteria?

- [x] [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~~
  - [x] All builds are passing
- [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)

See merge request !5063

Bump Rinku to 2.0.0

## What does this MR do?

Update Rinku gem to last stable version.

## What are the relevant issue numbers?

#18593 

## Does this MR meet the acceptance criteria?

- [x] [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~~
  - [x] All builds are passing
- [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)

See merge request !5064

Hacked in a better message for attachment network error

## What does this MR do?

Adds a better error message for when a user is uploading an attachment and they cannot reach the GitLab instance.

Now displays `Network error. Please check your connection.`.

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

As noted above, I think this is hacky, ideally this would be sent straight from the backend but if not then this should be handled globally?

/cc @fatihacet 

## Why was this MR needed?

Attachment upload UX

## What are the relevant issue numbers?

Closes #19161.

## Screenshots (if relevant)

*UPDATED:*

![Screen_Shot_2016-06-30_at_00.42.37](/uploads/b3b4044782dd4c4c17735e99acc45502/Screen_Shot_2016-06-30_at_00.42.37.png)

## 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 [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)

See merge request !4977

Naive attempt at fixing Underscore templates

## What does this MR do?

Attempts to fix part of #18939.

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

That this doesn't break anything.

## Why was this MR needed?

See #18939.

## What are the relevant issue numbers?

#18939 

## Does this MR meet the acceptance criteria?

- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing

See merge request !4842

Fixed markdown buttons in FF

## What does this MR do?

The markdown buttons weren't working with the `execCommand` function. So it has to fallback to replacing the value in the textarea.

See merge request !5085

Fix Changelog [ci skip]

Fixing a duplicate entry in the Changelog.

Fixes #19526 

See merge request !5098

Update installation & update guides for 8.10

[ci skip]

See merge request !5097

Don't show "request access" button to project owners

This MR fixes an issue where project owners that are not in the project's members list (I believe this is how we handled project owners before, now we seem to create a "Master" member for the project creator) would see the `Request Access` button.

This MR fixes this issue in a clean way by adding a new `:request_access` ability to replace an ugly helper.

It also give project owners the  ability to update & destroy a requester that would happen to be themselves (since owners could request access to their own project before this MR).

Related to #18790.

See merge request !5091

Add lib/gitlab/emoji.rb instead of gitlab_emoji gem and upgrade Gemojione

- No reason to split it into a separate gem when the gem barely did anything. We can use gemojione directly, making updating gemojione that much easier. Unless there's a particularly good reason we were using the gem?
- Fixes the Rake task since it broke after all the AwardEmoji changes.
- Update gemojione to 2.6.1.

Spring Update changes! http://emojione.com/releases/#2.2.0

See merge request !4919

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

Document custom Git hook error message

## What does this MR do?

Documents new functionality introduced by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5073

## Does this MR meet the acceptance criteria?

- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] 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)

See merge request !5088

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

Updated project header

## What does this MR do?

Updates the project header.

## What are the relevant issue numbers?

Closes #18544, #18832 

## Screenshots (if relevant)

![Screen_Shot_2016-06-29_at_14.16.16](/uploads/4df895e7ecf42e5ddab3f2f1e47f8c7e/Screen_Shot_2016-06-29_at_14.16.16.png)


See merge request !4989

Dumb-down avatar presence check in `avatar_url` methods

`avatar.present?` goes through CarrierWave, and checks that the file
exists on disk and checks its filesize. Because we're hitting the disk,
this adds extra overhead to something where the worst-case scenario is
rendering a broken image.

Instead, we now just check that the _database attribute_ is present,
which is good enough for our purposes.

See https://gitlab.com/gitlab-org/gitlab-ce/issues/19273

See merge request !5093

Fixed avatar alignment in new MR view

## What does this MR do?

Fixes the alignment of the avatar in the new MR compare view

## Screenshots (if relevant)

![Screen_Shot_2016-07-05_at_16.17.54](/uploads/9c427f66f8ef1d5ecee627e57ee61322/Screen_Shot_2016-07-05_at_16.17.54.png)

See merge request !5095

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

`avatar.present?` goes through CarrierWave, and checks that the file
exists on disk and checks its filesize. Because we're hitting the disk,
this adds extra overhead to something where the worst-case scenario is
rendering a broken image.

Instead, we now just check that the _database attribute_ is present,
which is good enough for our purposes.

See https://gitlab.com/gitlab-org/gitlab-ce/issues/19273

Upgrade Doorkeeper from 3.1.0 to 4.0.0.

Includes Rails 5 support and various bug fixes. Working toward #14286.

Changelog: https://github.com/doorkeeper-gem/doorkeeper/blob/master/NEWS.md#400

See merge request !5055

Remove current user link to the profile from sidebar

Because user avatar and link to the profile are duplicated in the header now

Related to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4939 and https://gitlab.com/gitlab-org/gitlab-ce/issues/18544

cc @iamphill @jschatz1 

See merge request !5077

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

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