Fix email images

## Dependencies:
This MR Depends on gitlab-org/html-pipeline-gitlab!4 being **merged and published** to rubygems.org

## What does this MR do?
This MR fixes the broken images in emails that occured scince we introduced access control for all attachments in 7.8.
The access control lead to broken images, because the user usually isn't logged into gitlab when opening the email in his mail client.
The solution to fix this, is to replace all images that were uploaded to gitlab as attachemnts with inline images in emails.

I only added one test for images in notes, because all notes share the same view. If it works fine for a note on a commit, then it'll also work the same for notes on a MR or on issues.

@DouweM can you review this please?

Closes #1161

See merge request !373

Fix missing GitHub organisation repositories on import page.

Private repositories belonging to organizations rather than users can't be imported because `client.repos(org.login)` was requesting `/users/:org_login/repos` (which only returns public org repo's), while we need `/orgs/:org_login/repos` (which includes both public and private). The `client.org_repos` method does this.

cc @marin This is a bug in 7.8.x, but I'm not sure if it needs a minor release now or if it can go in 7.9.

See merge request !1683

Add blue theme to GitLab

See merge request !1682

Emoji cheatsheet fix

Worked through the help text for emoji to properly reference and use EmojiOne tags. Removed the ninja and reworked the first sentence a bit, as ninja isn't supported by EmojiOne. Should resolve ticket #953.

See merge request !384

Conflicts:
	app/assets/stylesheets/generic/nav_sidebar.scss

Group controllers refactoring

Usefulness of this refactoring is not so obvious on CE codebase. But It will allow us to remove huge amount of code on the EE side.

See merge request !1684

This adds the functionality of replacing all images that were uploaded
to gitlab with inline images(base64) in emails.
This change fixes the broken images in emails that 7.8 introduced

Allow smb:// links in Markdown text.

As requested by Sam McLeod at https://gitlab.com/gitlab-org/gitlab-ce/issues/1184

See merge request !1669

Update html-pipeline and emoji

See merge request !1680

Conflicts:
	Gemfile.lock

add AMI update step

See merge request !1677

Remove annoying notice messages when create/update merge request

See merge request !1681

Bump gitlab_git to v7.1.0. It should fix a lot of encoding issues

For gitlab/gitlab_git!24

See merge request !1679

 Fix code preview theme setting for comments, issues, merge requests, and snippets

User color scheme was not being used: default white color scheme was always chosen. Also, default background for code in notes was always overriding the user color scheme.

Closes #1139

See merge request !357

Escape wildcards when searching LDAP by username.

Addresses https://dev.gitlab.org/gitlab/gitlabhq/issues/2086.

Also see https://dev.gitlab.org/gitlab/gitlab-ee/merge_requests/344 and https://dev.gitlab.org/gitlab/omniauth-ldap/merge_requests/2.

See merge request !1644

Remove placeholder methods to prevent calling methods rather than attributes.

Since we have https://dev.gitlab.org/gitlab/gitlabhq/blob/7-8-stable/app/models/service.rb#L79 makes no sense to have methods as a placeholder.

See merge request !1676

Dashboard restyle

For #2069

See merge request !1675

Generate valid json

This patch helps to be compatible to other programing languages as it improves the validation of hook data. It seems only ruby can handle 'nil' as value while other json decode function will fatal.

See merge request !182

Make email display name configurable

#216

See merge request !80