Prevent XSS via custom issue tracker URL

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/15437

See merge request !1955

Prevent information disclosure via new merge request page

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15591.

See merge request !1963

Prevent privilege escalation via "impersonate" feature

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15548

See merge request !1956

Prevent information disclosure via snippet API

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15580

See merge request !1958

Fixes XSS injection

REF: https://gitlab.com/gitlab-org/gitlab-ce/issues/15434

**Without the fix**

![xss1](/uploads/0a7b0b15fb87066965a7c73f1dbaa815/xss1.gif)


**With the fix**

![xss2](/uploads/473cfa0aa80656f24c58aebf1fd97fff/xss2.gif)


See merge request !1952

Fixes window.opener bug

Adds `noreferrer` value to rel attribute for external links

REF: https://gitlab.com/gitlab-org/gitlab-ce/issues/15331

See merge request !1953

Triggers blur after clicking award button

![blur](/uploads/6cd53a5ac314e8048c656685935747e2/blur.gif)

Fixes #15511

See merge request !3881

Fixed issue with project dropdown links not being clickable



See merge request !3870

Fixed issue with assignee object not being returned

Closes #15515

See merge request !3877

Add posibility to define a hidden job without 'script' in .gitlab-ci.yml

References #15451

/cc @ayufan 

See merge request !3849

Fix Error 500 due to stale cache when projects are renamed or transferred

See merge request !3865

Fix license detection to detect all license files, not only known licenses

Fixes #15470.

See merge request !3878

Refactor Todos feature spec to be faster and less brittle

We now only create two Todos instead of 21 when testing pagination, and
we've updated the test to be less brittle when dealing with slower CI
environments.

See merge request !3889

Use the `can?` helper instead of `current_user.can?`

Fixes #15513.

See merge request !3882

Allow middle-click on a Todo row to open in a new tab



See merge request !3899

Add --tags to fetching gitlab-shell to ensure tags are downloaded

Closes #15525

See merge request !3896

Correctly escapes label title in filters

Fixes #15522

See merge request !3880

Move cherry-pick feature specs to proper directory

Cherry pick feature specs were located in `spec/feature/project` directory while we have `spec/feature/projects`.

Later location is consistent with our namespaces (we have `Projects::` namespace, not `Project::`).

See merge request !3875

Bump gitlab-shell to 2.7.2

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15525

See merge request !3884

Don't break line in middle of word

<img src="/uploads/cceb1a4212ff7785ace03cd6468edf85/Screen_Shot_2016-04-21_at_3.32.00_PM.png" width="500px">

See merge request !3864

[ci skip]

Allow filtering by Owned projects on dashboard page

Closes #3799 

![Screen_Shot_2016-04-15_at_9.40.52_PM](/uploads/440498c5647bda282304891307931a02/Screen_Shot_2016-04-15_at_9.40.52_PM.png)

See merge request !3762

Add newest enhancements to GH importer docs

[ci skip]

See merge request !3867

Use new Note styleguide



See merge request !3866

Fixes text color on labels in sidebar

Previously the labels in the sidebar would just have `#FFF` text color which could cause problems with a light background color.

With this, the text color comes from the JSON.

See merge request !3846

Always read diff_view setting from the cookie

Prior, when the user had their view set to "parallel" and then visited a
merge request's changes tab _without_ passing the `view` parameter via
query string, the view would be parallel but the `Notes` class was
always instantiated with the default value from `diff_view` ("inline"),
resulting in broken markup when the form to add a line note was
dynamically inserted.

The cookie is set whenever the view is changed, so this value should
always be up-to-date.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14557 and https://gitlab.com/gitlab-org/gitlab-ce/issues/15285

See merge request !3732

Improved email confirmation UX

Closes #4228

See merge request !3184

Fix vulnerability that leaks private labels and milestones

## Summary

This fixes vulnerability that leaks information about private labels and milestones because of  insecure direct object reference in issueable create service.
This affects merge requests and issues.

See https://gitlab.com/gitlab-org/gitlab-ce/issues/15439

## Fix

This MR introduces additional check that rejects labels and milestone that does not belong to the same project issue/merg request does.

## Further work

`IssuableBaseService` may benefit from encapsulating filters in separate class/module, which then may improve coherency in this class.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15439

See merge request !1954

Remove float from blame link icon

Closes #15413   
<img src="/uploads/af6aea9102e1b42e5e92783ce818863c/Screen_Shot_2016-04-21_at_1.57.56_PM.png" width="200px">



See merge request !3861

Instrument Gitlab::GitAccess/GitAccessWiki



See merge request !3859

Fix undefined local variable error in Invalid MR template

Closes #15408

See merge request !3857

File name change appears on one line

Closes #15445

<img src="/uploads/51714555be63af16b810cf528de49192/Screen_Shot_2016-04-21_at_9.22.43_AM.png" width="500px">

See merge request !3854

Fixed issue with author link color on dark diffs

Correctly added a color to the author link

![Screen_Shot_2016-04-21_at_08.55.05](/uploads/ffa9e12e868c7b71fa4dd9244114274a/Screen_Shot_2016-04-21_at_08.55.05.png)

Fixes #15444

See merge request !3847

Refactor the update documentation



See merge request !3822

Fixes "create label" functionality on label dropdown

**Issue sidebar**

![label_dropdown](/uploads/2a056136fc88626530fc275ded0c2aa3/label_dropdown.gif)

**Issues page**

![label_dropdown_issues](/uploads/965fd20f5b206499e9b11a64556c5240/label_dropdown_issues.gif)



See merge request !3670

Remove the `.distinct` when finding issues

See merge request !3858

Disable 'repository check' feature in 8.7.0

See merge request !3856

Removed JS update templates

See merge request !3814

Filter labels by including ALL filter titles

Fixed query to use `AND` and not `OR`. Refactored relevant specs

See merge request !3815