Use gitlab-workhorse 0.6.0

[ci skip]

See merge request !2483

Ensure Gravatar host looks like an actual host

Solves #10243.

I've chosen to simplify the method that extracts the host: since we
only need the host, let's get rid of the path and thus get rid of the
escaping problems!

Unit tests should ensure that most of the cases are covered.

See merge request !2482

See merge request !2481

See merge request !2480

See merge request !2479

When using IssuableFinder with a Group we can greatly reduce the amount
of projects operated on (due to not including all public/internal
projects) by simply passing it down to the ProjectsFinder class.

This reduces the timings of the involved queries from roughly 300
ms to roughly 20 ms.

Fixes gitlab-org/gitlab-ce#4071, gitlab-org/gitlab-ce#3707

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