Update docs for shared runner default settings

GitLab 8.2 updated shared runners to default to `ENABLED` on all projects.

Fixes #5993

See merge request !2358

Load autocomplete data when loading an issue page



See merge request !2312

fixes new branch button positioning, when visible and not visible container

Fixes #5893
#5893 was not completely fixed. If a new branch was pushed the container is in correct position but if no container existed the position was incorrect. This MR fixes that. 

See merge request !2348

Add pencil icon to edit group settings

Move icons to upper-right corner of group page

Before:

![image](/uploads/6694c33eae6e10a4e21efef465a07114/image.png)

After:

![image](/uploads/0c17c2cf89fc0fde4344911b30f2635c/image.png)

Closes #6038

See merge request !2361

Added housekeeping for git repositories

This merge request will add a housekeeping button in the project setting page which invoke the gitlab shell to run a `git gc` in the project repository.

see gitlab-org/gitlab-ce#3041

Depends on gitlab-org/gitlab-shell!23 which has been merged.


See merge request !1658

Issue#5817 Improve wording of the web hooks page on the project's setting

Merge Request !2362 had  a typo, I'm resubmitting the merge request about issue #5817.

See merge request !2363

Move icons to upper-right corner of group page

Closes #6038

Fix Error 500 when visiting build page of project with nil runners_token

Properly ensure that the token exists and add defensively check for a
non-nil value.

Closes #4294

See merge request !2294

Properly ensure that the token exists and add defensively check for a
non-nil value.

Closes #4294

[ci skip]

Do not call API if there is no API URL

Fixes #5878 

CE users may not be interested in the new JIRA features. In this case,
we should detect they haven't set an API URL and fallback to the
behavior pre-8.3. This patch does that very easily.

There are planned improvements to JIRA in future releases such as
gitlab-org/gitlab-ce#5541 which will make this more configurable.

See merge request !2341

Add CHANGELOG entry for reply-by-email fix

[ci skip]

See merge request !2359

Fixes #5993

Disable "Already Blocked" button in admin abuse report page

See merge request !2360

[ci skip]

Clean up document on adding users to a project

Closes #3093, #3648

See merge request !2356

[ci skip]

changes verb `references` to noun `reference`.

See merge request !2349

An addition to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2292

Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/4667

See merge request !2313

Also, Open Graph data, if you're into that kind of thing.

[ci skip]

Add API project upload endpoint

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/4317

See merge request !2329

Add 'new' as a reserved namespace name

Closes #5930

See merge request !2344

Suppress e-mails on failed builds if allow_failure is set

Every time I push to GitLab, I get > 2 emails saying a spec failed when I don't care about the benchmarks and others that have `allow_failure` set to `true`.

@ayufan mentioned creating a summary e-mail to prevent getting one e-mail per build, but the latter might actually be desirable. For example, I do want to know if Rubocop errors fail right away.

See merge request !2178

Add spec for single-item task lists

Follow-up to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2330

See merge request !2340

This ensures the dropdown is fully available the moment a user starts
typing out a username, issue ID, etc. While this won't speed up loading
the autocomplete data itself it should at least make it less annoying
for the user.

Fix problem with projects ending with .keys #3076

Closes #3076

Move route `:username.keys` below project's routes. This allow project's to handle names ending with `.keys`

See merge request !1883

Project services and JIRA documentation clean up

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/176

This was first aiming to fix the JIRA references to EE, but as I was going through it, I decided to revamp more.

@Haydn once merged here and then Valery merges CE into EE it should be fixed in doc.gitlab.com as well.

@dblessing the docs state that we support JIRA 6.x. I see that 7.x is out, should the docs be amended? Also we seem to have a place to document services (http://doc.gitlab.com/ce/project_services/project_services.html), but the JIRA doc is under integration :/ I'd like it to have it moved under `project_services/`, but I guess most customers know the current URL better.

See merge request !2345

[ci skip]

See merge request !2346