gitlab import UI - icon, file selector, etc... Also updated font-awesome and modified import source settings.

Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce into feature/project-export-ui-experimental

Fixed issue with assignee object not being returned

Closes #15515

See merge request !3877

Merge branches 'feature/project-export' and 'feature/project-import' into feature/project-export-ui-experimental

Closes #15515

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

Improved email confirmation UX

Closes #4228

See merge request !3184

[ci skip]

Use new Note styleguide



See merge request !3866

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

[ci skip]

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

This also verify if milestone belongs to correct project before creating
a new issue.

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

Closes #4228

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

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

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

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

Refactor the update documentation



See merge request !3822

Add db:migrate:reset task to CI
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

cc @DouweM @stanhu 

See merge request !3788

Instrument Gitlab::GitAccess/GitAccessWiki



See merge request !3859

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>