API: Expose 'developers_can_push' for branches

## What does this MR do?

Adds support for the `developers_can_push` flag for the branches API. It also supports creating protected branches with that flag.

## Are there points in the code the reviewer needs to double check?

The API call requires an optional boolean parameter `developers_can_push`. If it is not either `true` or `false`, it should not update the value. I'm not sure if this is the right way to do it.

Right now it always returns `200`. Maybe the `PUT` method should return different status codes depending if it really created or updated a branch.

## What are the relevant issue numbers?

Closes #12735 

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5208

Render only commit title

## What does this MR do?
Render only commit title in builds



## Why was this MR needed?
Better readability

## What are the relevant issue numbers?
Closes #19420 

## Screenshots (if relevant)
![after](/uploads/fcdd59d74a0f91f6ac847f7f02d5f07f/after.png)![before](/uploads/71ca6dabf31452a1a8dfb15ecb8860c5/before.png)
## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added


- Tests

- [x] All builds are passing
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

cc: @kradydal @yorickpeterse @grzesiek @tmaczukin @dzaporozhets [@tomash](https://github.com/tomash) [@chastell](https://github.com/chastell)

this is connected to closed MR [!5109](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5109)

See merge request !5131

Fix MR diff encoding issues exporting projects

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/19338

See merge request !5039

Disable transaction when adding index for Ci::Pipeline

## What does this MR do?
Adds missing `disable_ddl_transaction!`

## Why was this MR needed?
Fixes a broken migration for PostgreSQL


See merge request !5319

Store when and yaml variables in builds table

## What does this MR do?
Stores `when` and `yaml_variables` in `ci_builds` table.

## Why was this MR needed?
This is done in order to simplify the code responsible for creating a pipeline builds.

## What are the relevant issue numbers?
This made as a pre-step for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5295.

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5296

Make docker registry work with location redirects when external storage is used

## What does this MR do?

Honor `Location:` header when working with local registry.
Location makes it possible to download manifests from external storage.

## What are the relevant issue numbers?

Fixed https://gitlab.com/gitlab-org/gitlab-ce/issues/18477

## Remark

Adding `FollowRedirects` makes that we leak `Authorization:` in followed requests.

That is why it is implemented manually and we are explicitly removing `Authorization` header.

cc @marin @twk3 

See merge request !4677

Add Pending Tab to Builds

## What does this MR do?

Add Pending Tab to Builds and separate "running" and "pending" jobs in UI.

## Why was this MR needed?

Increase visibility to "pending" .

## What are the relevant issue numbers?

Closes #19408 

## Screenshots

Before:
![Zrzut_ekranu_2016-07-05_o_11.52.48](/uploads/01dc1f3664f5aacb2ec09d52d19c521e/Zrzut_ekranu_2016-07-05_o_11.52.48.png)

After:
![Zrzut_ekranu_2016-07-05_o_11.51.34](/uploads/f3be02427996fecf50c65dd51ce1b9fb/Zrzut_ekranu_2016-07-05_o_11.51.34.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

cc @ubudzisz @yorickpeterse @grzesiek @tmaczukin @zj [@chastell](https://github.com/chastell) [@tomash](https://github.com/tomash)

See merge request !5084

Allow empty repos on import/export

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/19849

See merge request !5312

API: Expose due_date for issues

## What does this MR do?

Add support for the `due_date` of issues to the API.

## What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/18696

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5212

Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce into store-variables-and-when-in-builds-table

# Conflicts:
#	db/schema.rb

Track a user who creates a Pipeline

## What does this MR do?
This adds additional column to pipelines to track user who is creating pipelines.

## Why was this MR needed?
This is to make it possible to show all pipelines created by specific user and to later solve: https://gitlab.com/gitlab-org/gitlab-ce/issues/18054

## What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18992

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5272

Fix creation of deployment on build that is retried, redeployed or rollback

## What does this MR do?
Add missing `environment` to be copied when retrying a build.

## Why was this MR needed?
The retried builds did not create a deployments.

## What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/19521

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5275

Fix CHANGELOG

Fix build spec for pending tab

Add Pending Tab to Project Builds

Update CHANGELOG

Allow to access Container Registry for Public and Internal projects

## What does this MR do?
Adds missing ability `read_container_image` for `public scope` which affects users accessing public and internal projects.

## Why was this MR needed?
Previously, we allowed to use container registry for anonymous users, but did not allow to do the same for logged in.
This MR makes it possible.

## What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18176 https://gitlab.com/gitlab-org/gitlab-ce/issues/19668 https://gitlab.com/gitlab-org/gitlab-ce/issues/19117

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5279

Fix stage status shown for pipelines

## What does this MR do?
Properly calculates a status of stage when shown on a list of pipelines

## Why was this MR needed?
Previously we were calculating a status for all builds, including retried ones. 
This were affecting a overall stage status when a build were retried.

## What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18896 https://gitlab.com/gitlab-org/gitlab-ce/issues/18150

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5277

Limit number of project export retries to 3

I think 3 should be a sufficient number of retries - at the moment we were doing 20+

This will only send a maximum of 3 emails if the project export went wrong. Tested - project import is not affected.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18966

See merge request !5267

Fix LFS CI fetch

## What does this MR do?
Fixes LFS fetching for CI objects that were kind of broken.

## Why was this MR needed?
This also refactors LFS tests to be a blackbox tests instead of whitebox tests. Actually testing GrackAuth instead of LFSRouter.

## Related isssues
Resolves: https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/issues/1199

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)


See merge request !5270

Allow a project import URL to be blank to prevent false positives in validation

Projects that happen to have blank import URLs were failing validation, causing project settings not to be saved. Loosen the requirement and don't try to use the import data if the URL isn't present.

Closes #19893

See merge request !5309

Fix not normalized emoji paths

## What does this MR do?
It normalizes emoji names in `api` and `toggle_award`

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?
User was able to store +1 and thumbsup to databse, causing UI inconsistency.

## What are the relevant issue numbers?
Fixes #19104 

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5060

preventing settings from being saved

Resolve "Pipelines view has manual actions"

## What does this MR do?
Removes the deploy button from pipelines

## Why was this MR needed?
The button didn't do anything

## What are the relevant issue numbers?
Closes #19907 

## Screenshots (if relevant)
<img src="/uploads/9488cf238f67463f7dac8f9dbc34f7e1/Screen_Shot_2016-07-16_at_5.52.10_PM.png" width="300px">


See merge request !5299

Fix CI yaml example

## What does this MR do?

Fixes a  typo in a CI yaml example.

## What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/19888

See merge request !5304