Refactor ZenMode

- No longer depends on the "hidden checkbox".
- No longer depends on manually storing/restoring the scroll position.
  Instead, we take advantage of jquery.scrollTo.
- Event-based.
- Simplifies the state-based styling.

See merge request !2354

Fix caching issue where build status was not updating in project dashboard

The project dashboard page would show a stale build status since the caching key did not depend on it. Fix by adding the commit status if CI is applicable.

Closes #3268

See merge request !2353

Only load autocomplete data when actually needed



See merge request !2365

Fix typo in build page of projects

The column containing links to the builds is named Runner but actually
contains the Build.

See merge request !2347

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

Previously this would result in autocomplete data being loaded for every
page (e.g. the page showing all Git branches of a project).

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

The column containing links to the builds is named Runner but actually
contains the Build ID.

[ci skip]

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]

- No longer depends on the "hidden checkbox".
- No longer depends on manually storing/restoring the scroll position.
  Instead, we take advantage of jquery.scrollTo.
- Event-based.
- Simplifies the state-based styling.

Closes #3268

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