Support YAML alias/anchor usage in .gitlab-ci.yml

This allows to reuse one job as a template for another one:

```
job1: &JOBTMPL
  script: execute-script-for-job

job2: *JOBTMPL

```

This also helps to solve some of the issues in gitlab-org/gitlab-ci#342

See merge request !2958

Affix the build scroll controls

Closes #4709

See merge request !3109

Change all instances of "web hooks" to "webhooks"

See merge request !3169

[ci skip]

OCD hooooooooo!

[ci skip]

Fixes broken layout of web editor page on mobile

Fixes #13987 

<p><img src="https://gitlab.com/gitlab-org/gitlab-ce/uploads/3a58e7b576c25d5929bc1cdcbe163161/Screen_Shot_2016-03-10_at_1.13.19_PM.png" alt="Screen_Shot_2016-03-10_at_1.13.19_PM" width="487"></p>

See merge request !3167

Adds mention of Redcarpet as Markdown parser in docs

It makes it easier for users to find the source of issues related to
Markdown parsing.

[ci skip]

See merge request !3168

Moves build status tooltip on issues

See merge request !3156

rewrite logo to simplify SVG code

_Originally opened at !3129 by @slang._

- - -

The look of the logo is obviously unchanged... This just gets rid of some useless SVG groups that Sketch made.

See merge request !3164

Use an exclusive lease for LDAP checks

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/14134

Merge https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3140 first.

Only perform LDAP checks for a user after acquiring a lease. Checks
during user login do not require a lease.

The lease has a fixed expire time of 10 minutes.

See merge request !3143

Set position to auto left so that if it is off-screen it goes to the right

Allow filtered explore results to be paged. Fixes #14104



See merge request !3149

Parse config/resque.yml in one place only



See merge request !3140

Set color text to blue for links inside gray areas

Closes #14011 

![](/uploads/4bce32cf7be4414f947a97cf266f7b0d/Screen_Shot_2016-03-09_at_6.53.12_PM.png)

See merge request !3147

Dropdown JS



See merge request !3112

Fixed flicker of download project button

Closes #14177

![download-button-flicker](/uploads/21e8ccc68ed66394c8ec65ca549f94ad/download-button-flicker.gif)

See merge request !3152

Decrease the font size and the padding of the `.anchor` icons used in the README

_Originally opened at !2819 by @roperzh._

- - -

## What does this MR do?

Removes an overlap between the anchor icons on the readme and the sidebar on small screens by reducing the size and the padding of the icon.

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

Probably someone in the Design / UX team will need to review if the solution makes sense.

## What are the relevant issue numbers?

Issue #13334

## Screenshots

![Screen_Shot_2016-02-15_at_3.35.13_PM](/uploads/0e8b215809eee8efec9b6a136b0bd841/Screen_Shot_2016-02-15_at_3.35.13_PM.png)

See merge request !3150

Optimize Project#ci_service(s)

Related issue: gitlab-org/gitlab-ce#14186

See merge request !3158

Fixed quick submit on note edit

Also removed the cloning of forms for note edits. Instead it just hides/shows the form seeing as it is already there

Closes #14094

See merge request !3151

The method Project#ci_services would load all services into memory
(including _all_ their columns) and then use Enumerable#select to reduce
the list. Project#ci_service in turn would further reduce this list down
to just 1 Service instance.

Instead of doing all this in Ruby we can just offload the work to the
database, reducing the amount of time spent in these methods. These
changes reduce the time of the first call to Project#ci_services from
around 240 ms to around 10 ms, though the final timings will vary based
on database load. Because Project#ci_service is memoized there's no
further overhead introduced by using a database query.

Fixes gitlab-org/gitlab-ce#14186

Fixes issue with markdown snippet not being copyable

On markdown snippets this adds a hidden div with the raw markdown content so that it can be copied

Closes #13882

See merge request !3153