* Use match instead match?

This reverts commit 78ba7bcf.

This reverts commit 07ec2c7b.

* Use match instead match?

`DeviseMailer` did not correctly handle display names set via
`Gitlab.config.gitlab.email_display_name` if they contained spaces or
special characters. It has been adjusted to handle addresses in the same
way `BaseMailer` does.

We cannot support these features at this time and they are just
cluttering the UI.

There are only three templates and they are framework-specific. The are
removed to lower complexity of the project creation page.

2FA could be enabled but still was not usedi on sign-in.

The following formerly separate commits have been merged in:

* Adjust 'Sign in' button for GitLab's CSRF protection

  GitLab introduced CSRF protection for authentication requests in
  571ba5a7. The 'Sign in' button has been
  adjusted to send a POST request.

* Opt out of turbolinks for 'Sign in' button

This restriction does not apply to admins.

This restriction does not apply to admins.

The project variable can hold an object which is not an instance of
Project (e.g. ProjectWiki). In this case, visibility_level is not
defined.

Additionally, the prompt to set a password is no longer shown for CAS
users.

[ci skip]

[11.5] Fix requiring the rubyzip Gem

See merge request gitlab/gitlabhq!2877

In commit 6fa5fd85 the `require: false`
was removed to ensure the Gem was loaded at run time. Unfortunately, the
`require` necessary for the rubyzip Gem is "zip" and not "rubyzip". As a
result, Bundler would not require the Gem. This meant that we would
still run into constant errors when referring to `Zip::File`.

[ci skip]

[ci skip]

This reverts commit 25241cd7.

[11.5] Fix uninitialized constant with GitLab Pages deploy

See merge request gitlab/gitlabhq!2874

pages:deploy step was failing with the following error:

```
unitialized constant SafeZip::Extract::Zip
```

Since license_finder already pulls in rubyzip, we can make it
a required gem. We also use the scope operator to make the reference to
Zip::File explicit.

[ci skip]