Add content attributes to discussion diffs; change styling of add-note icon to prevent white spaces in paste

Start with iid on branch creation

After the discussion it in #3886 it was decided the iid should be in the beginning of the branch name.

See merge request !3708

Update shibboleth configuration for GitLab 8.6 and Apache 2.4



See merge request !3713

Add TOC to yaml README and an intro section



See merge request !3719

[ci skip]

Added highlight colours to diff rows

Closes #13852

Refactor and expose only Gitlab::UrlBuilder.build(record)

```
$ git grep Gitlab::UrlBuilder

app/models/commit.rb:      url: Gitlab::UrlBuilder.build(self),
app/services/issues/base_service.rb:      issue_url = Gitlab::UrlBuilder.build(issue)
app/services/merge_requests/base_service.rb:      hook_data[:object_attributes][:url] = Gitlab::UrlBuilder.build(merge_request)
app/views/search/results/_note.html.haml:- note_url = Gitlab::UrlBuilder.build(note)
lib/gitlab/note_data_builder.rb:        base_data[:object_attributes][:url] = Gitlab::UrlBuilder.build(note)
spec/lib/gitlab/note_data_builder_spec.rb:    expect(data[:object_attributes][:url]).to eq(Gitlab::UrlBuilder.build(note))
spec/lib/gitlab/url_builder_spec.rb:describe Gitlab::UrlBuilder, lib: true do
```

Fixes #15202.

See merge request !3696

Note form

A lot of the forms have the same actions associated with them so I have created a standard class that encapsulate these actions.

There is also another class that allows toolbar action buttons to be added that will insert different characters based on the HTML `data-prefix` attribute value - this will give us the opportunity to add more actions to the form and maybe create a markdown toolbar in the future.

See merge request !3534

Updated JS spec to include gl_form

Updated the JS to have a standard class with standard actions for each form
Created ability to have toolbar buttons that insert different prefixes dependant upon the data-prefix attribute

Do not require recipients when pusher will be recipient

Closes #10946

See merge request !3603

Closes #13574

API issue update and note create back dating

Closes #14947 

See merge request !3551

Add test for search page

Closes #15222

See merge request !3711

Redis configuration consistency

Related https://gitlab.com/gitlab-org/gitlab-ce/commit/cf669551f69edd66913d22c96cf1de1302e7990e

See merge request !3697

Hide top search form on the search page

Closes #14771

![Screen_Shot_2016-04-11_at_6.04.19_PM](/uploads/44cf2110bad29c0df06d874740a3a61f/Screen_Shot_2016-04-11_at_6.04.19_PM.png)

See merge request !3668

Set tooltips for new added labels

Fixes #15093 

![Screen_Shot_2016-04-11_at_5.50.21_PM](/uploads/52d06f6ccb3ca42e7ce75b94111514c2/Screen_Shot_2016-04-11_at_5.50.21_PM.png)

See merge request !3667

Update delete button

Closes #14762 

![Screen_Shot_2016-04-11_at_5.21.32_PM](/uploads/fef09645eb70fc0fcaee359245664ddc/Screen_Shot_2016-04-11_at_5.21.32_PM.png)

See merge request !3665