Added X-GitLab-... headers to emails from CI and Email On Push services

Fixes #2098

This adds the 'X-GitLab-Project', 'X-GitLab-Project-Id' and
'X-GitLab-Project-Path' headers to emails from CI and Email On Push in a way
that it is done currently for merge requests and issues emails.

Additionally, CI emails will have 'X-GitLab-Build-Status' header with either
'fail' or 'success'.

Emails from Email On Push will include 'X-Gitlab-Author' header containing the
username of user who did the push.

See merge request !2159

Starring project only increases star count

This is instead of increasing star & fork count

Fixes #11396

![star-count](/uploads/9a1d569393bc051d1a019f0340eec957/star-count.gif)

cc. @jschatz1 

See merge request !2504

Allow LDAP users to change their email if it was not set by the LDAP
server

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/3054

See merge request !2502

Fix double request issue in artifacts browser

This fixed problem with double propagation when clicking a link that lies inside tr with clicked event attached.

See merge request !2496

Creator should be added as a master of the project on creation

Fixes: #4222

See merge request !2463

Greatly improve external_issue_tracker performance

See 3d41133d48f6522b8755bb91b804864e8e520871 for all the details. As an aside, this commit contains a set of migrations that will introduce downtime as they add a column with a default value which in turn locks the entire table (at least on PostgreSQL).

See merge request !2498

Fix positioning issues with browse files button

Issue is that in Firefox clipboard is blocking the browse files
from moving all the way to the right.
Move clipboard up 1px into -1px to unblock "browse files"

SS from firefox:

![Screen_Shot_2016-01-18_at_4.01.58_PM](/uploads/312a5f1e55ca707081f718e2413416fb/Screen_Shot_2016-01-18_at_4.01.58_PM.png)

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/10849


See merge request !2489

Reduce margin to fit dropdowns

![Screen_Shot_2016-01-18_at_7.51.23_PM](/uploads/03336f86fde25d6d045742297a19751c/Screen_Shot_2016-01-18_at_7.51.23_PM.png)

Fixes #10747 

See merge request !2492

Improve UX in build artifacts browser

This improves UX in build artifacts browser, and makes it more consistent with repository tree browser we already have.

---
Before:

![ux_artifacts_before](/uploads/9869ff74afd5e6636f0df81c7823fb6f/ux_artifacts_before.png)

---
After:

![ux_artifacts_after](/uploads/cdb68925f4489bb852fd701870e6d6a0/ux_artifacts_after.png)

---

It is easier to click on a file/directory entry now, because we don't need to click on a entry's basename (that can be really short, like `..` parent directory). We also show `Compressed to` size that indicates how much storage does this entry really consume.

Row for an entry is also highlighted on hover and we do not have Download button (clicking on a file row / file basename is enough to download a file).

Closes #10242 

See merge request !2477

Move entry `Fix: As an admin, cannot add oneself as a member to a
group/project`

The CHANGELOG entry said it was fixed in 8.2.3. However, I found
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1942 that
suggests it wasn't fixed until 8.3.0. A customer experienced this
issue on 8.2.3, still. This ultimately led to me investigating this
further.

[ci skip]

See merge request !2488

Fix limit for `data` column in `events` table when using MySQL

Closes #9084 

See merge request !2486

Update devise to version 3.5.4

Closes https://dev.gitlab.org/gitlab/gitlabhq/issues/2642

See merge request !2490

Remove leading comma when user is the only one to award that emoji

Fixes #9073

See merge request !2450

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

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

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

Autofill abuse message text with user url. Closes #2838

See merge request !2396

Prevent StateMachine warnings from outputting during a cron task

[ci skip]

Closes #5931

See merge request !2458

Fix autocomplete for new issues/MRs/snippets

Fixes gitlab-org/gitlab-ce#8067

See merge request !2446

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

Also fix a few places where page_404 should be render_404.