Fix margin around Markdown Write/Preview tabs.

Reverts !1354 and uses another fix for #2585.

See merge request !1654

Animate the logo on hover

The logo is now rendered as pure SVG, rather than image referencing a
svg. The SVG has an id and the shapes of the logo have a shared class.
The shapes change their fill color on hover with a transition.

Identical to how it looks on about.gitlab.com

cc @skyruler 

See merge request !1557

Make tables full width.

## Before

![Screen_Shot_2015-10-19_at_11.17.32](/uploads/acea66825b41006a949b5cc31cc07699/Screen_Shot_2015-10-19_at_11.17.32.png)

## After

![Screen_Shot_2015-10-19_at_11.19.16](/uploads/ed61e5e6cafe06c5e2d75672f5585c93/Screen_Shot_2015-10-19_at_11.19.16.png)


See merge request !1642

Ensure MySQL CI limits DB migrations occur after the fields have been created

Closes https://github.com/gitlabhq/gitlabhq/issues/9753

See merge request !1653

Clear archive cache asynchronously



See merge request !1651

Closes https://github.com/gitlabhq/gitlabhq/issues/9753

Add missing migrations

See merge request !1652

The logo is now rendered as pure SVG, rather than image referencing a
svg. The SVG has an id and the shapes of the logo have a shared class.
The shapes change their fill color on hover with a transition.

Speed up searching for text references a bit



See merge request !1648

Correctly find last known blob for file deleted in MR.

Fixes #3092.

When building a new MR, `@merge_request.commits.last` would fail because this delegates to `merge_request_diff` which is still `nil` at that point. I fixed that, and changed some of the logic because showing deleted blob contents didn't previously work for the Compare page, and the UI would show the wrong commit sha for "View File @...".

See merge request !1647

Redirect to a default path if HTTP_REFERER is not set

Safari 9.0 does not yet honor the HTML5 `origin-when-cross-origin` mode,
and it's possible load balancers/proxies strip the HTTP_REFERER from
the request header. In these cases, default to some default path.

Closes #3122

Closes https://github.com/gitlabhq/gitlabhq/issues/9731

See merge request !1646

Update 8.0-to-8.1 update guide

- User needs to update gitlab-git-http-server
- User needs to update Nginx configuration

[ci skip]

See merge request !1625

Simplify patch version updates (less steps)

Update CHANGELOG

Safari 9.0 does not yet honor the HTML5 `origin-when-cross-origin` mode,
and it's possible load balancers/proxies strip the HTTP_REFERER from
the request header. In these cases, default to some default path.

Closes #3122

Closes https://github.com/gitlabhq/gitlabhq/issues/9731

If a node is ignored there's no need for searching for a given pattern.
In turn, when searching for the pattern there's no need to construct a
MatchData object as we only care about presence (or lack thereof), not
the resulting matches.

In terms of performance this cuts down about 200 ms when loading
issue #2164 locally, though this varies a bit depending on system load.

Fix duplicate repositories in GitHub import page

By default, all the current user's repositories are accessible via the
/users endpoint. There's no need to traverse all the organization
repositories as well.

See:

* http://www.rubydoc.info/github/pengwynn/octokit/Octokit/Client/Repositories#repositories-instance_method
* https://developer.github.com/v3/repos/#list-your-repositories

Closes #2523

See merge request !1644

Fix regex in redis version check

By default, all the current user's repositories are accessible via the
/users endpoint. There's no need to traverse all the organization
repositories as well.

See:

* http://www.rubydoc.info/github/pengwynn/octokit/Octokit/Client/Repositories#repositories-instance_method
* https://developer.github.com/v3/repos/#list-your-repositories

Closes #2523

Send an email to admin email when a user is reported for spam

Replaces !1547.

Fixes #2839.

See merge request !1634

Fix missing commit status for widget when no CI service is enabled

Fix for #3082 

/cc @dzaporozhets 

See merge request !1621

[ci skip]