Add missing "omniauth" prefix to option in docs

This MR is specifically a fix for #3319. I wanted to make my first contribution to GitLab, so I picked a simple one!

This changes the omniauth documentation for the `block_auto_created_users` option to `omniauth_block_auto_created_users`.

Thanks

---

closes #3319 

See merge request !1734

Use a relative link instead of full URL with New Issue button to be consistent

Relates to #3095

See merge request !1631

Changes block_auto_created_users to omniauth_block_auto_created_users,
otherwise the option is ignored. Fixes #3319.

Avoid render edit_form in each notes.

Remove deprecated dumped yaml file generated from previous job definitions



See merge request !1777

Fix "Other Builds" links in Projects Build page

Found a minor issue where all links in the "Other Builds" section of Project Builds was linking to the same build #. This should fix it.

See merge request !1785

Allow to define cache in `.gitlab-ci.yml`

This extends `.gitlab-ci.yml` syntax to allow specifying caching files and directories between builds, making it easy to preserve ex. gems.

```
cache:
  paths:
  - .bundle
  - vendor/

before_script:
- bundle install --path vendor/

rspec:
  script:
  - bundle exec rspec
```

This is based on Build Artifacts changes.

/cc@dzaporozhets 

See merge request !1786

Use RJS to render edit note feature.

Before:

```
Rendered projects/notes/_note.html.haml (27.9ms)
Rendered projects/_zen.html.haml (0.3ms)
Rendered projects/notes/_hints.html.haml (0.7ms)
Rendered projects/_md_preview.html.haml (3.9ms)
Rendered projects/notes/_edit_form.html.haml (6.9ms)
Rendered projects/notes/_note.html.haml (17.7ms)
Rendered projects/_zen.html.haml (0.3ms)
Rendered projects/notes/_hints.html.haml (0.6ms)
Rendered projects/_md_preview.html.haml (3.4ms)
Rendered projects/notes/_edit_form.html.haml (7.0ms)
```

After:

```
Rendered projects/notes/_note.html.haml (13.8ms)
Rendered projects/notes/_note.html.haml (7.1ms)
Rendered projects/notes/_note.html.haml (9.5ms)
Rendered projects/notes/_note.html.haml (8.5ms)
```

This change reduce at least 6ms * N ('N' - number of notes).

Add flay: tool to find duplicate code
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1789

[ci skip]

Add method complexity check to CI
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1783

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

Change "recent" scopes to sort by "id"

These scopes can just sort by the "id" column in descending order to
achieve the same result. An added benefit is being able to perform a
backwards index scan (depending on the rest of the final query) instead
of having to actually sort data.

See merge request !1788

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

These scopes can just sort by the "id" column in descending order to
achieve the same result. An added benefit is being able to perform a
backwards index scan (depending on the rest of the final query) instead
of having to actually sort data.

Prevent people from adding the link back.



See merge request !1938

Implement Build Artifacts

This implements #3028 

1. It stores artifacts in shared/artifacts,
1. It adds `artifacts` to `.gitlab-ci.yml`,
1. We use GitLab Workhorse to offload artifacts uploading,
1. To download artifacts it uses GitLab Workhorse X-Sendfile extension,
1. There's one "artifact" per-build. The new upload removes previous one and creates a new one,
1. Default max artifact size is set to 100MB - this can be changed in settings.

Missing things:
1. Support for `.gitlab-ci.yml`: `artifacts: true or git-ls-files` which will upload all non tracked files,
1. Artifacts passing between builds.

GitLab Workhorse changes: https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/5
GitLab Runner changes: https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/merge_requests/46

Syntax:
```
artifacts:
  untracked: true # default: false
  paths: # default: empty
  - bin/files
```


See merge request !1584

Send build name and stage in CI notification e-mail



See merge request !1776

Add allow_failure field to commit status API

Closes #3196

See merge request !1685

[ci skip]

Fix duplicate entry for 8.1.0 release

Fix Drone CI service template not saving properly

This fixes an Error 500 when attempting to save a Drone CI template in the service template page. `hook.url` was not being used and depended upon a project when none existed.

/cc: @bugagazavr

Closes #3419

See merge request !1774

Closes #3419

Fix for https://github.com/gitlabhq/gitlabhq/pull/9783

Remove text-rendering property

Continues !1779

Closes #3220

[ci skip]

See merge request !1784

Closes #3220

[ci skip]

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

Replace CoffeeScript block into JavaScript in Views.

Remove CSS property preventing hard tabs from rendering in Chromium 45

This is to workaround a bug in Chromium 45 (https://code.google.com/p/chromium/issues/detail?id=446434),
which is the default browser in Ubuntu 14.04 and older.

Closes #3220

See merge request !1779

Remove duplicate CHANGELOG etnries

[ci skip]

See merge request !1782