Let the CI runner know about builds that this build depends on

This allows us to implement artifacts passing: runner will download artifacts from all prior builds. It will happen automatically, and always, as long as artifacts are enabled.

## The changes:

This MR exposes list of prior builds in CI::API::Builds.

**The API response when asking for builds**

```json
{
  "id": 48584,
  "ref": "0.1.1",
  "tag": true,
  "sha": "d63117656af6ff57d99e50cc270f854691f335ad",
  "status": "success",
  "name": "pages",
  "token": "9dd60b4f1a439d1765357446c1084c",
  "stage": "test",
  "project_id": 479,
  "project_name": "test",
  "commands": "echo commands",
  "repo_url": "http://gitlab-ci-token:token@gitlab.example/group/test.git",
  "before_sha": "0000000000000000000000000000000000000000",
  "allow_git_fetch": false,
  "options": {
    "image": "docker:image",
    "artifacts": {
      "paths": [
        "public"
      ]
    },
    "cache": {
      "paths": [
        "vendor"
      ]
    }
  },
  "timeout": 3600,
  "variables": [
    {
      "key": "CI_BUILD_TAG",
      "value": "0.1.1",
      "public": true
    }
  ],
  "dependencies": {
    "builds": [
      {
        "id": 48584,
        "ref": "0.1.1",
        "tag": true,
        "sha": "d63117656af6ff57d99e50cc270f854691f335ad",
        "status": "success",
        "name": "build",
        "token": "9dd60b4f1a439d1765357446c1084c",
        "stage": "build",
        "project_id": 479,
        "project_name": "test",
        "artifacts_file": {
          "filename": "artifacts.zip",
          "size": 0
        }
      }
    ]
  }
}
```

## How it will work?

**Example:**
```
build:
  type: build
  script:
  - echo TEST > test_file
  artifacts:
    untracked: true

rspec:
  type: test
  script:
  - test-my-project

staging:
  type: deploy
  script:
  - scp test_file root@server.com:
```

**The flow:**
1. We run `build`. The `build` creates a file `test_file`. This file gets archived and send us build artifacts.
2. We run `rspec`. The `rspec` downloads build artifacts from `build`. Uses the `test_file`.
3. We run `staging`. The `staging` downloads build artifacts from `build` and `rspec`, but since the `rspec` doesn't have build artifacts we skip that build. Deploys the `test_file`.

This partially implements the https://gitlab.com/gitlab-org/gitlab-ce/issues/3423.

In the next release we will introduce option to configure what artifacts are received.

/cc @grzesiek @DouweM @sytse @rspeicher


See merge request !2437

Allow access to artifacts for users with reporter role

This is originally introduced by @ajohnsn in this merge request: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2259

I've added and refactored specs, original commit by @ajohnsn has been cherry picked here.

See merge request !2448

Don't send (fake) email during dev bootstrap

This allows you to do:

    rake dev:setup BOOTSTRAP=1

and prevent dozens of letter_opener email popups in your browser.

In the latest GDK we automatically set BOOTSTRAP=1 during `make`.

[ci skip]

See merge request !2447

Simplify Procfile

These changes are meant to make development easier.

[ci skip]

See merge request !2429

Fix signup using kerberos

kerberos only provides a username and an email, but no name. Therefore a signup fails because the name is empty. Best guess for the name is probably the username, therefore use it as name.

I also created an issue for this: #5945

See merge request !2336

Consider that URL can end with '/' before redirecting.

Closes #7975

See merge request !2416

some OAuth providers (kerberos for example) only provide a username and an email, but no name. Therefore
a signup fails because the name is empty. Best guess for the name is
probably the username, therefore use it as name.

[ci skip]

This allows you to do:

    rake dev:setup BOOTSTRAP=1

and prevent dozens of letter_opener emai popups in your browser.

Refactor GitHub importer documentation

To be merged when gitlab-org/gitlab-ce!2324 is finished.

See merge request !2390

Also fix a few places where page_404 should be render_404.

This behavior got lost in the previous commit.

Fix javascript error with deleting messages in issue or merge request

Elements searched for by jQuery no longer existed in the DOM.
Javascript was also unnecessarily complex, for using jQuery

Fixes #8109

See merge request !2442

Moving 8.5 change to 8.4 since we're merging master into stable for now.

[ci skip]

Elements searched for by jQuery no longer existed in the DOM.
Javascript was also unnecessarily complex, for using jQuery
Fixes #8109

Prefer custom WOFF2 fonts if the browser supports them

[ci skip]

See merge request !2443

[ci skip]

Add triggers API

References #4264

See merge request !2286

Fixes new layout

* fix empty project page
* fix commit -> builds page missing margin

See merge request !2440

* master: (150 commits)
  fixes margin and padding
  Update mailroom/postfix documentation [ci skip]
  Fix css mess around git clone panel. Align it properly
  Fix missing padding for user/group pages
  Fix parse_gollum_tags matcher
  Update documentation on Banzai::Filter::GollumTagsFilter
  Add tests for the wiki pipeline
  Refactoring Banzai::Filter::GollumTagsFilter
  Make sure the .git is at the end on Gitlab::GithubImport::WikiFormatter
  Remove GollumTagsPipeline
  Refactoring Gitlab::GithubImport::Importer
  Remove unnecessary brackets on WIKI_SLUG_ID route constraints
  Move js function to removing accents to vendor/assets/javascripts
  Update CHANGELOG
  Use the WikiPipeline when rendering the wiki markdown content
  Add Banzai::Filter::GollumTagsFilter for parsing Gollum's tags in HTML
  Relax constraints for wiki slug
  Import GitHub wiki into GitLab
  Move Ci::Build#available_statuses to AVAILABLE_STATUSES constant in CommitStatus
  Revert changes to how the notes are paginated in the API
  ...

Conflicts:
	doc/api/README.md
	lib/api/entities.rb

fixes margin and padding

![Screen_Shot_2016-01-14_at_3.10.57_PM](/uploads/83c8b36b01439cb629c91b2dd3a85692/Screen_Shot_2016-01-14_at_3.10.57_PM.png)


See merge request !2439

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

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

Properly generate diff of orphan commits, like the first commit in a
repository

Fixes gitlab-org/gitlab_git#14

See merge request !2427

This allows us to implement artifacts passing: runner will download artifacts from all prior builds

Backport two commits from EE

Backport part of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/110

See merge request !2424

Fix cross-project reference clipboard text

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2339

See merge request !2420

Update mailroom/postfix documentation [ci skip]

I worked with a customer to troubleshoot some strange Postfix and Mailroom issues. These doc updates aim to help other users avoid the same confusion.


See merge request !2430

Various UI fixes

* Fix missing padding for user/group pages
* Fix align of clone panel
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !2433

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

Add builds API

References #4264

See merge request !2207

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

Add pagination headers to already paginated API resources

Following #3045, I've added pagination headers using already available Kaminari methods.

## Pagination headers in action

![Screen_Shot_2016-01-14_at_12.14.53](/uploads/88807f754dd9aafbb24da85f6bdf9521/Screen_Shot_2016-01-14_at_12.14.53.png)

---

I've also added a shared example to test paginated API resources.

A possible next step would be to paginate all the API resources that return an array.

See merge request !2426