Added Rake task for tracking deployments

## What does this MR do?

This MR adds a Rake task to track the current version of GitLab in InfluxDB.

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

We may want to document this Rake task in some Markdown file, but I'm not sure what the best place for this would be.

## Why was this MR needed?

We want to have a more accurate overview of when deployments occurred. 

## What are the relevant issue numbers?

https://gitlab.com/gitlab-com/infrastructure/issues/98

## 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~~
- [x] 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)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5320

Api delete todos

## What does this MR do?

It changes the `DELETE /todos` to only return the number of marked todos.

## Why was this MR needed?

Before it returned the marked todos as an paginated array. Since we deleted/marked the todos, there was no way to get the rest of the todos.

## What are the relevant issue numbers?

Closes #19678

## 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 !5341

This simply inserts the current GitLab version in the "deployments"
measurement.

Fixes gitlab-com/infrastructure#98

Change color of today issue highlight



See merge request !5329

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

Fix MR diff encoding issues exporting projects

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

See merge request !5039

WIP - trying to replicate UTF-8 error

fix spec

fixing encoding issue and another spec, to do with MR diffs

fix issue and spec failure

Add changelog and bumped up I/E version

fix spec based on feedback - omitted target project

Small ui improvements

* make file tree row 2px smaller for more compact view
* make sub navigation  background a bit darker for better contrast with main navigation

cc @hazelyang @alfredo1 

See merge request !5315

Update documentation for build artifact dependencies

## What does this MR do?

Update documentation for build artifact dependencies

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

## Why was this MR needed?

#19892 

## What are the relevant issue numbers?

#19892 

## Screenshots (if relevant)


See merge request !5332

Update MAINTENANCE.md with our latest policy

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/19958

See merge request !5339

[ci skip]

Fix of 'Commits being passed to custom hooks are already reachable when using the UI'

This is back-port of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/563

## What does this MR do?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/19771
This MR changes the way how we create commit, we create it directly in the branch and we don't use temporary ref anymore. This also works similar to how `git-receive-pack` works so it's a natural way to create commit.


## What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/issues/19771

See merge request !5337

Upgrade gemojione to 3.0.0

Upgrades gemojione to 3.0.0, see the Changelog: https://github.com/jonathanwiesel/gemojione/blob/b98aa8b07eef815d4d3f52ff3c8714b28932b0de/CHANGELOG.md#v300-2016-07-12

[Here are all the new 2016 emoji](http://emojione.com/releases/2.2.4/) 🎉

This update has new emoji and more sensical categories.

See merge request !5237

Fixed the alignment in the MR widget

## What does this MR do?

Fixes the alignment of the browse button in the MR widget

## Screenshots (if relevant)

![Screen_Shot_2016-07-17_at_17.47.54](/uploads/41dcb0fad38fdd4dbccfda5ffaeaec6e/Screen_Shot_2016-07-17_at_17.47.54.png)

See merge request !5307

Blurs the clicked link in dropdown menus

## What does this MR do?

This fixes an issue where the dropdown menu would stay visible even when clicked out of it

See merge request !5322

Improve cron_jobs loading error messages

## What does this MR do?

Improves the error message from "Sidekiq Cron Jobs" plugin, when trying to load a incorrect definition from gitlab config files.

This is the output before the fix:

```
2016-06-08T16:43:19.277Z 2890 TID-gso49ojro INFO: Booting Sidekiq 4.1.2 with redis options {:url=>"unix:/var/run/redis/redis.sock", :namespace=>"resque:gitlab"}
undefined method `delete' for nil:NilClass
/home/git/gitlab/config/initializers/sidekiq.rb:16:in `block (2 levels) in <top (required)>'
/home/git/gitlab/config/initializers/sidekiq.rb:16:in `each'
/home/git/gitlab/config/initializers/sidekiq.rb:16:in `block in <top (required)>'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-4.1.2/lib/sidekiq.rb:70:in `configure_server'
```

This is the output after the fix:

```
2016-07-18T10:53:22.414Z 66332 TID-oxal1bmik INFO: Booting Sidekiq 4.1.4 with redis options {:url=>"redis://localhost:6378", :namespace=>"resque:gitlab"}
Invalid cron_jobs config key: 'registry'. Check your gitlab config file.
/home/git/gitlab/config/initializers/sidekiq.rb:21:in `block (2 levels) in <top (required)>'
/home/git/gitlab/config/initializers/sidekiq.rb:17:in `each'
/home/git/gitlab/config/initializers/sidekiq.rb:17:in `block in <top (required)>'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/ruby-2.1.8/gems/sidekiq-4.1.4/lib/sidekiq.rb:70:in `configure_server'
```

Fixes #18378

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

No

## Why was this MR needed?

Original error doesn't give any hint on where the problem can be, so the user can't easily troubleshoot unless he knows implementation details.

## What are the relevant issue numbers?

#18378

## 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 !5318

Allow build email service to be tested

Fixes #13343 

See merge request !5223

Content Security Policy

Ref: #18231 

This uses twitter's [secure_headers gem](https://github.com/twitter/secureheaders).

See merge request !4770

Collapsed diffs lines/size don't accumulate to overflow diffs.

## What does this MR do?

Reduce the number of lines that we highlight on big diffs to try to reduce the degradation introduced by  !4990 as you can see on the issue description #19820 .

We collapse any files after the diff is over the number of safe files (100), or over the safe lines (500) or over the safe number of bytes (5KB x 100 files).

We still need to bump the gitlab_git and point this branch to the new gitlab_git version.

## What are the relevant issue numbers?

Closes #19820 
Closes #19885

## 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)~~
- ~~[ ] 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 !5306

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

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