Fix line diff side-by-side line highlighting

## What does this MR do?

Fixes line highlighting in diff side-by-side view from working correctly.

The JS was looking for a class, but the class doesn't exist & instead it was a data attribute.

## Screenshots (if relevant)

![Screen_Shot_2016-09-13_at_10.26.15](/uploads/7aca730efb14d7bd6bad2a8712fe39d2/Screen_Shot_2016-09-13_at_10.26.15.png)

See merge request !6316

Scrolls active tab into middle of nav on mobile

## What does this MR do?

On mobile (or smaller screens) it scrolls the currently active tab into the middle of the nav.

## Screenshots (if relevant)

![Screen_Shot_2016-09-15_at_09.38.55](/uploads/4170271b53b9509a385fa7844fb3dc78/Screen_Shot_2016-09-15_at_09.38.55.png)

See merge request !6363

Simplified the CSS for issue boards

## What does this MR do?

It gained a lot of extra cruft through the different improvements etc. This removes a lot of the stuff which would hopefully also speed up the browser rendering.

- Removed flexbox from a lot of things which in turn reduces it's complexity.
- Removed styles that either aren't used or aren't needed.
- Various other improvements to the CSS.

Basically just improved the CSS by removing overly complex CSS. There are no visible changes to issue boards, just less CSS for the same results.

See merge request !6352

Fixed commit search UI

## What does this MR do?

Fixes the UI for commits in search.

If the scope of the search is commits then it renders the list in a `ul` to match the same styling as that on the commits UI.

## Screenshots (if relevant)

![Screen_Shot_2016-09-05_at_15.30.12](/uploads/f567a224be44d5a9b015ac5d1c399bd7/Screen_Shot_2016-09-05_at_15.30.12.png)

## What are the relevant issue numbers?

Closes #21868

See merge request !6205

Fix anchor icon regression

An error in scss prevented the markdown header `:hover` anchor icon svg from linking correctly:

![Screen_Shot_2016-09-14_at_4.06.19_PM](/uploads/f4d31a17a58bd7cbde572f91c316dfe1/Screen_Shot_2016-09-14_at_4.06.19_PM.png)

The following currently 404s:  
<https://gitlab.com/assets/icon_anchor.svg>  

## What are the relevant issue numbers?

#20459 & !5577

See merge request !6358

Replace contributions calendar timezone payload with dates

## What does this MR do?
Fixes a ~regression bug introduced in !5784 whereby the calendar squares would not render due to a timezone mismatch between the server timezone and the browser (user) timezone. I am now returning the dates instead of the timezone from the backend. There's a good chance we will still have a calendar off by one error (which is an existing issue #1943) but passing dates should make sure that the calendar activity squares render correctly across timezones.

## Are there points in the code the reviewer needs to double check?
Double check that this displays the correct calendar squares when the GitLab instance is hosted in a different timezone than the user viewing it

## Why was this MR needed?
Fixes ~regression issue 😞 

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-09-13_at_9.47.06_PM](/uploads/d8b41b9b43320f021452e39f29b0e194/Screen_Shot_2016-09-13_at_9.47.06_PM.png)

After:
![Screen_Shot_2016-09-13_at_9.46.11_PM](/uploads/e09a3b35eef77ee1cf73b924c3815d3a/Screen_Shot_2016-09-13_at_9.46.11_PM.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 [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [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)

## What are the relevant issue numbers?
Closes #21921

See merge request !6336

Use oj gem for faster JSON processing

See merge request !6395

It's mainly intended to improve Elasticsearch indexing performance
(through multi_json gem), but other gems could benefit from it too, like
grape.

Bump fog-aws and other dependent modules

fog-aws CHANGELOG: https://github.com/fog/fog-aws/blob/master/CHANGELOG.md

Notable improvements:

* Support for ap-south-1 region
* Fix for empty ETag values

Closes #22260

See merge request !6392

Merge branch '22256-nomethoderror-api-entities-note-missing-attribute-note-on-awardemoji-0x00000015142480' into 'master'

Fix API notes endpoint when posting only emoji

Closes #22256

See merge request !6387

Closes #22260

MergeRequest#environments now returns an empty array when diff_head_commit is nil

## Does this MR meet the acceptance criteria?

- [x] No CHANGELOG needed for a bug introduced in an RC.
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] 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)

## What are the relevant issue numbers?

Closes #22246

See merge request !6379

Fixes incorrect reference to `@repository.root_ref` in _readme.html.haml.

Fixes #22083

See merge request !6369

Remove schema annotations completely

It removes schema annotations completely. The https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4099 has not done that

See merge request !6386

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

Increase ci_builds artifacts_size column to 8-byte integer to allow larger files

See merge request !6333

Integer migration style

See merge request !6334

Add link to article on how to write reliable, asynchronous tests with Capybara

This article has been incredibly useful for all developers. Adding a link to it so more people can refer to it.

See merge request !6312

Hides tooltip on discussion toggle button when clicking

## What does this MR do?

Hides the tooltip when clicking the discussion toggle button.

Rather than triggering the tooltip to hide we trigger blur. This is because of how _amazing_ Bootstraps tooltips are. They are shown also on focus so if we trigger the tooltip to hide & then mouseover the button again the tooltip still shows. 

## What are the relevant issue numbers?

Closes #20750

See merge request !6303

Fixed issue boards loading issues on large screens

## What does this MR do?

On larger screens it is possible for 20 issues to load (this is the amount per page) & there still to be room underneath the last issue which means the list can't scroll stopping the infinite scrolling working.

This MR checks if there are more issues to load, if there are & the height of the scroll area is less than or the same as scroll height then more issues are loaded. This will keep happening until it is possible to scroll, once it is possible to scroll it goes back to the default behaviour of the infinite scrolling.

## What are the relevant issue numbers?

Closes #22092

See merge request !6319

Fix issuable templates dropdown for forked projects

fixes #21824

See merge request !6329

Added group-specific setting for LFS.

Groups can enable/disable LFS, but this setting can be overridden at the project level. **Admin only**

Closes #18092

See merge request !6164

Bump rubocop-rspec to 1.7.0

See merge request !6357

Fix spelling: sucessfully -> successfully

Originally from gitlab-org/gitlab-ee!682

See merge request !6376

Sort secret keys by key instead of id.

Closes #20870 

See merge request !6275

Fix undefined method when reverting migration `RemoveProjectsPushesSinceGc`

See merge request !6375

CI stages

#### What does this MR do?
Removes individual columns for each stage, consolidating them into one `Stages` column

#### Screenshots (if relevant)
![Screen_Shot_2016-09-14_at_12.32.41_PM](/uploads/24f8d817481ba8f711c127bf143649ba/Screen_Shot_2016-09-14_at_12.32.41_PM.png)

#### What are the relevant issue numbers?
Closes  #21925

See merge request !6338

Signed-off-by: Rémy Coutable <remy@rymai.me>