Escape HTML in commit titles in system note messages

Closes #17348

See merge request !4084

Fix build notification on merge request page change even if the build status didn't change

## What does this MR do?
This MR contains a bugfix for #17357 which was introduced by !3998. The notification are now only shown on status changes, and not when switching between different merge requests.

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

## Why was this MR needed?
Because auf a bug introduced in !3998.

## What are the relevant issue numbers?
#17357

Closes #17357

See merge request !4086

docs(api): adapted user API documentation to match with latest API

The user API documentation and the actual implementation were out of sync, missing certain newly introduced fields and beeing inconsistent between certain API definitions. The documentation was changed according the actual latest implementation.
Signed-off-by: Fabio Huser <fabio@fh1.ch>

See merge request !4067

blost -> blog



See merge request !4063

Update CI example docs.

Docs for CI examples are updated as follows:

- Fix a dead link from CI example top to `dpl`
- Specify Django for a Python project, not Rails
- Use the latest Python Docker image as [Heroku supports only Python 3.5.1 (and 2.7.11)](https://devcenter.heroku.com/articles/python-support)
- Show the latest Docker Hub URL links.

See merge request !4082

Update Docker Hub and Engine links

1. Update all links to Docker Hub.
2. Update or rename Docker with Docker Engine.

See merge request !4083

We're hiring.

Help with recruiting, saw it in other readme's too.

See merge request !4080

Update SVG sanitizer to conform to SVG 1.1

Original SVG sanitizer would strip out necessary elements and attributes.

Use a custom Loofah scrubber since sanitize 2.x transformers are inadequate to handle case-sensitive SVG attributes since they parse documents as HTML instead of XML, which causes all SVG attribute names (e.g. `viewBox`) to be downcased.

* SVG element list: https://www.w3.org/TR/SVG/eltindex.html
* SVG attribute list: https://www.w3.org/TR/SVG/attindex.html

Closes #14555

See merge request !3401

Closes #17348

Reduce delay in destroying a project from 1-minute to immediately

This 1-minute delay was causing confusion among customers. Was there a reason this needed to be 1 minute?


See merge request !3997

Run ProjectDestroyWorker after pending_delete attribute has been committed to DB

Use a custom Loofah scrubber since sanitize 2.x transformers are inadequate
to handle case-sensitive SVG attributes. sanitize parses documents as HTML
instead of XML, which causes all SVG attribute names (e.g. viewBox) to be downcased.

* SVG element list: https://www.w3.org/TR/SVG/eltindex.html
* SVG attribute list: https://www.w3.org/TR/SVG/attindex.html

Closes #14555

Make group settings button white instead of gray for better visibility
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

cc @annabeldunstone @skyruler 

See merge request !4078

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

Add nice new Todo bell

![H5bp___Html5_Boilerplate___GitLab](/uploads/e8725396a5d77a8db09742f977595605/H5bp___Html5_Boilerplate___GitLab.png)

![H5bp___Html5_Boilerplate___GitLab](/uploads/011a21ee1653502c4f78543e28d97b67/H5bp___Html5_Boilerplate___GitLab.png)

![H5bp___Html5_Boilerplate___GitLab](/uploads/0858cb9621463ef6a32237fcb0b4f63d/H5bp___Html5_Boilerplate___GitLab.png)

Fixes: #15671 

See merge request !4077

Move group settings navigation to own partial

A bit of refactoring for !3980
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !4076

Align code within links in comments

Closes #17343

<img src="/uploads/78e03c1dc0e99c7bdb686d9d120a4525/Screen_Shot_2016-05-06_at_9.28.26_AM.png" width="800px">

See merge request !4073

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

Annotate models

See merge request !4071

Update db/schema.rb after running db:migrate:reset

See merge request !4074

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

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

Redesign navigation for group pages

Part of #14838. This MR targets on desktop version. Mobile version improvements will be in separate merge request 

See merge request !3980

Auto-set title for branches created from issues

This sets the title for a new MR to 'Resolves "$issue-title"' when:
- The source branch for the MR begins with a value iid.
- The MR has more than one commit in its diff (if there's one commit, keep using the commit's first line).
- The iid does not point to a confidential issue.

Single commit:

![A single commit uses the commit title](/uploads/cd34f59cd67f095c3034fae07950f8b5/image.png)

Multiple commits:

![Multiple commits use the issue title](/uploads/a322c406ddd56913c5aebd88d16e5a5e/image.png)

Confidential issue:

![A confidential issue uses the branch name](/uploads/7ae9b79de5f6101ced46802f3c3a6e71/image.png)

cc @DouweM @zj 

Closes #14564

See merge request !3966

Use outer join for issues ordering by milestones due.

This MR contains an implementation for Solution 1 suggested in #14183 

Ordering by Milestone due sooner/later ("milestone sort") filters issues without a milestone, which can let users feel like disappearing issues without a milestone.

See merge request !3872

If a branch starts with an issue's IID, followed by a hyphen, the
description will be updated to say that is closes the issue. This also
updates the title of the merge request to 'Resolves "$issue-title"', as
long as:
- There is more than one commit in the merge request (if there is only
  one commit, the commit's title will be used as before)
- The issue's IID is valid for the project

Update annotations on models



See merge request !3962

The user API documentation and the actual implementation were out of sync, missing certain newly introduced fields and beeing inconsistent between certain API definitions. The documentation was changed according the actual latest implementation.
Signed-off-by: Fabio Huser <fabio@fh1.ch>

Assign labels milestone when moving issue

Closes #14532.

See merge request !3934