Document new API pagination headers

Document new API pagination headers introduced in !2426. Solves #8098.

/cc @dzaporozhets @dblessing

See merge request !2435

- Fix heading names
- Fix curl example
- Use full request output
- Use table for the extra headers

update

old
![Screenshot_2016-01-14_22.46.52](/uploads/d165897a6118c4b276e6b53982077cb5/Screenshot_2016-01-14_22.46.52.png)

new
![Screenshot_2016-01-14_22.46.21](/uploads/6b34cd8b1a2799506676103fcbc80450/Screenshot_2016-01-14_22.46.21.png)


See merge request !2441

Raise hook url limit

1. Up varchar url limit to 2000 chars instead 255
2. Maybe migration?
3. 255 characters - it is not enough
4. nil
5. nil

See merge request !1940

Removes white line when hiding diff comments in MR

Fixes #6071 

See merge request !2407

Fixes issue where firefox does not delete message after comment submit

Issue was **not** in the way comment was being submitted.
`app/assets/javascripts/awards_handler.coffee` was throwing an error.
This error was preventing any js from running after it.
Fixes #1473

See merge request !2452

Use a more sensible message for the AbuseReport uniqueness validation

Previously it was "user has already been taken", when really we were
saying the user has already been reported.

See merge request !2461

Issue page keeps jumping up

This happens when the discussion side is smaller than the sidebar and the sidebar will need to scroll. When this happens I calculate the height of the two and see if the discussion panel is smaller and make them the same height and add a class `no-affix` which makes the sidebar relative positioning so it won't stick to the top.

See merge request !2417

[ci skip]

Previously it was "user has already been taken", when really we were
saying the user has already been reported.

Autofill abuse message text with user url. Closes #2838

See merge request !2396

Add the version each feature was introduced in GitHub importer



See merge request !2457

[ci skip]

Added advanced SAML troubleshooting

/cc @dblessing @balameb

See merge request !2456

Prevent StateMachine warnings from outputting during a cron task

[ci skip]

Closes #5931

See merge request !2458

[ci skip]

Closes #5931

Fix autocomplete for new issues/MRs/snippets

Fixes gitlab-org/gitlab-ce#8067

See merge request !2446

Issue was **not** in the way comment was being submitted.
`app/assets/javascripts/awards_handler.coffee` was throwing an error.
This error was preventing any js from running after it.
Fixes #1473

Fix alignment issues after a fix on titles weight

Fixes #8102. Fixes #3956. This fixes an alignment regression introduced by !2422. Sorry about that! :/

## Commit title alignment fixed

![Screen_Shot_2016-01-14_at_16.10.01](/uploads/8fdc08dca379bc551f5872de910c7149/Screen_Shot_2016-01-14_at_16.10.01.png)

**The fact that the first row has a smaller height than the other rows was not introduced by !2422 (I've checked by reverting 818607f0 on `master`).**

## Tags name in list

![Screen_Shot_2016-01-14_at_16.10.09](/uploads/fba3978037677bb8855f374b5f38dde0/Screen_Shot_2016-01-14_at_16.10.09.png)

See merge request !2431

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