Resolve "Inconsistency: Repo Title "down caret" cropped on smaller viewports"

## What does this MR do?

Fixes an issue where the dropdown chevron for a project list was not visible on smaller viewports.

This MR also changes the dropdown trigger into a `button` element for better accessibility (it can now be tabbed to like any link).

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

None that I can think of.

## Why was this MR needed?

Better accessibility and support for smaller viewports.

## Screenshots (if relevant)

Dropdown toggle now targetable by pressing tab to select.
![Screen_Shot_2016-08-31_at_9.12.15_PM](/uploads/8b2038a8ae259efd32da2e94a309ce88/Screen_Shot_2016-08-31_at_9.12.15_PM.png)

Chevron no longer hidden when project title length triggers `overflow: ellipsis`.
![Screen_Shot_2016-08-31_at_9.13.38_PM](/uploads/382e76c06e54bc307106a84ec21ab892/Screen_Shot_2016-08-31_at_9.13.38_PM.png)

## Does this MR meet the acceptance criteria?

- [x] 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)

## What are the relevant issue numbers?

Closes #21506

See merge request !6140

Replace play icon font with svg

## What does this MR do?
Replaces the `play` font awesome icon with svg

## Are there points in the code the reviewer needs to double check?
Make sure that the svg is looking great on all the changed pages

## Why was this MR needed?
SVG is better than fonts 😄 

## What are the relevant issue numbers?
 #21455 

## Screenshots (if relevant)
Before (Pipeline):
![Screen_Shot_2016-08-26_at_4.16.16_PM](/uploads/90a75b91b516e643f2134e053b0d7590/Screen_Shot_2016-08-26_at_4.16.16_PM.png)

After (Pipeline):
![Screen_Shot_2016-08-26_at_4.15.49_PM](/uploads/44e44a3d4c14066b8b7ec8c3da36e012/Screen_Shot_2016-08-26_at_4.15.49_PM.png)

Before (Environments):
![Screen_Shot_2016-08-31_at_3.03.35_PM](/uploads/bd4087a9f01c1a4d3c373d2662df4fe5/Screen_Shot_2016-08-31_at_3.03.35_PM.png)

After (Environments):
![Screen_Shot_2016-08-31_at_3.00.23_PM](/uploads/0ec45031bedb271f16bea3544cbfe52b/Screen_Shot_2016-08-31_at_3.00.23_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 [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 !6038

Center build stage columns in pipeline overview

## What does this MR do?
Centers the build stage table content and headers in the [pipeline view](https://gitlab.com/gitlab-org/gitlab-ce/pipelines)

## Are there points in the code the reviewer needs to double check?
Need to check whether it is okay to remove the following ([commit that added this property](https://gitlab.com/gitlab-org/gitlab-ce/commit/6130376ad6673facb729b78878f9156a29948a5b))
```
.light {
    width: 3px;
}
```

## Why was this MR needed?
Improve UI

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-08-31_at_12.46.43_PM](/uploads/cc4973d2155b59b32ec6fde714fbc26d/Screen_Shot_2016-08-31_at_12.46.43_PM.png)

After:
![Screen_Shot_2016-08-31_at_12.46.28_PM](/uploads/561d7b3973398c827d88870b38136c7d/Screen_Shot_2016-08-31_at_12.46.28_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 [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 #21708

See merge request !6135

Project tools visibility level

## part of #19734   

![project_features_access_level](/uploads/81ec7185d4e61d7578652020209af925/project_features_access_level.png)

## 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 !5606

Merge request sha info

## What does this MR do?

Exposes `sha` and `merge_commit_sha` items in `MergeRequest` API endpoint data.

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

No.

## Why was this MR needed?

It's useful information.

## What are the relevant issue numbers?

Closes #20456.

## Screenshots (if relevant)

N/A

## 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 !5966

Use JavaScript tooltips for mentions

## What does this MR do?

- use JavaScript tooltips instead of plain title for mentions (issue, merge request, snippet, user, group, commit, commit range, milestone)

## Why was this MR needed?

JavaScript tooltips look nicer and can wrap.

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5261#note_13106713, fixes #21500

See merge request !5301

Order award tooltips by their created_at date

## What are the relevant issue numbers?

Closes #20601

See merge request !6086

Fix suggested colors options for new labels in the admin area

## What does this MR do?

Execute the JS related to the suggested colors options when user access the new label in the admin area.

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

No.

## Why was this MR needed?

Clicking in a suggested color when creating a new label in the admin area don't change the background color.

## Screenshots (if relevant)

* Before

    ![2016-08-31_19.56.14](/uploads/3d50236dac578910c5062aa1e83da350/2016-08-31_19.56.14.gif)

* After

    ![2016-08-31_19.58.59](/uploads/376ffdcbb5b80ef51ab1d642fe9486d0/2016-08-31_19.58.59.gif)

## Does this MR meet the acceptance criteria?

- [X] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [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)

## What are the relevant issue numbers?

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/21726

See merge request !6138

Expire commit view partial after a day

See merge request !6128

Add MR Documentation description template

Add an MR Documentation template for `gitlab-ce`.

See merge request !6145

Hide group control nav if no options present

## What does this MR do?

Hides the group nav controls if no options present in the dropdown.
Also fixed the alignment of the dropdown to match the project page.

## What are the relevant issue numbers?

Closes #19120 

See merge request !5155

GitHub importer use default project visibility for non-private projects

## What does this MR do?

GitHub importer use the `Default Project Visibility` setting for all non-private projects.

## Why was this MR needed?

This allow users to import projects when `Public` visibility is restricted.

## What are the relevant issue numbers?

Fixes #21437

See merge request !6023

Refactor ability.rb into Policies

## What does this MR do?
Factors out `ability.rb` into a new abstraction - the "policy" (stored in `app/policies`). A policy is a class named `#{class_name}Policy` (looked up automatically as needed) that implements `rules` as follows:

``` ruby
class ThingPolicy < BasePolicy
  def rules
    @user # this is a user to determine abilities for, optionally nil in the anonymous case
    @subject # this is the subject of the ability, guaranteed to be an instance of `Thing`
    can! :some_ability # grant the :some_ability permission
    cannot! :some_ability # ensure that :some_ability is not allowed. this overrides any `can!` that is called before or after
    delegate! @subject.other_thing # merge the abilities (can!) and prohibitions (cannot!) from `@subject.other_thing`
    can? :some_ability # test whether, so far, :some_ability is allowed
  end

  def anonymous_rules
    # optional. if not implemented `rules` is called where `@user` is nil. otherwise this method is called when `@user` is nil.
  end
end
```

See merge request !5796

Add a BroadcastMessage API

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/21628

See merge request !6112

Fix bug where pagination is still displayed despite all todos marked as done

## What does this MR do?
Changes the todo `mark all as done` button callback to remove pagination and add user friendly text `"You're all done!"` so that it is consistent with what the page should look like after refreshing

## Are there points in the code the reviewer needs to double check?
Shouldn't be

## Why was this MR needed?
Resolve existing UI inconsistency

## Screenshots (if relevant)
Before:
![8xDRiXB1TL](/uploads/479edbdedf8d468b4c5e502f36a0c19f/8xDRiXB1TL.gif)

After:
![q4XDxhujPX](/uploads/3566eb538e6ad5a2d32b78351b9bc47d/q4XDxhujPX.gif)

## Does this MR meet the acceptance criteria?

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

## What are the relevant issue numbers?
Closes #21048

See merge request !6113

Check for existance of elements under test in application_spec.js

## What does this MR do?

Checks that the elements under test in `application_spec.js` actually exist.

## Why was this MR needed?

```
$ echo 'just garbage' > spec/javascripts/fixtures/application.html.haml 
$ bundle exec teaspoon spec/javascripts/application_spec.js 
2 examples, 0 failures
```

See merge request !6051

Fixed escaping issue with labels filter

## What does this MR do?

Encodes label names to stop any JS errors.

## What are the relevant issue numbers?

Closes #15552

See merge request !6123

Remove redundant js-timeago-pending from user activity log

## What does this MR do?
Enables the `skip_js` feature of `time_ago_with_tooltip()` since the frontend was already re-initializing `timeago` on all the elements after it received the data from the backend.

## Are there points in the code the reviewer needs to double check?
Shouldn't be

## Why was this MR needed?

*  Reduces bandwidth usage (Reduced by ~3.1kb)
*  Removes redundant code
*  Happy DOM 🎈 

## What are the relevant issue numbers?
Closes #21063 

## Screenshots (if relevant)
Before (DOM):
![Screen_Shot_2016-08-18_at_11.14.18_AM](/uploads/8be02cff27e452670988db8ff54bd57c/Screen_Shot_2016-08-18_at_11.14.18_AM.png)

After (DOM):
![Screen_Shot_2016-08-18_at_11.26.51_AM](/uploads/a0c5cbcd4c7b8e524a848b50dbd88c55/Screen_Shot_2016-08-18_at_11.26.51_AM.png)

Before (Bandwidth):
![Screen_Shot_2016-08-18_at_11.28.24_AM](/uploads/c37de0b398d7c66770f1def1777ca11a/Screen_Shot_2016-08-18_at_11.28.24_AM.png)

After (Bandwidth):
![Screen_Shot_2016-08-18_at_11.29.49_AM](/uploads/dc21719b965df1e73c868470447a1b20/Screen_Shot_2016-08-18_at_11.29.49_AM.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)

See merge request !5871

Filters tags by name

Closes #21673 

See merge request !6121

Fix sorting issues by "last updated" after import from GitHub

## What does this MR do?

Don't touch Issue/Merge Request when importing GitHub comments as it will trigger an update on `updated_at` field. It also use `updated_at` as the last updated date doesn't matter the Issue/Pull Request state.

## Why was this MR needed?

After import from GitHub, sorting issues by "last updated" doesn't work as expected.

## What are the relevant issue numbers?

Fixes #21567

See merge request !6110

Fix toggler_behavior.js to toggle ajax loaded contents like `diffs` page.

## What does this MR do?

Fix toggle in diffs

## What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/21676, https://gitlab.com/gitlab-org/gitlab-ce/issues/21686.

See merge request !6119

Fixed invisible scroll controlls on build page on iPhone

## What does this MR do?
Fixes invisible scroll controls on build page on iPhone

## Are there points in the code the reviewer needs to double check?
No.

## Why was this MR needed?
Because it's not correct behavior.

## Screenshots (if relevant)

| Before | After |
| -------- | -------- |
| ![IMG_0424](/uploads/19a6b498ad8be265e52619b9e7b71975/IMG_0424.PNG)   | ![IMG_0425](/uploads/3f7a7e00475a2e4c78e77e3bc76ac9f3/IMG_0425.PNG)  |

## 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
  - [ ] 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)

## What are the relevant issue numbers?
Not found

See merge request !6125

Fix Sentry not reporting right program for Sidekiq workers

Moves program tag into the global configuration since this doesn't change and since Sidekiq workers get a unique context for each event.

Closes #21410

See merge request !6004