Make namespace API available to all users

### What does this MR do?

This MR makes it possible for a user to query namespaces to which he/she has access. Also, it adds documentation for the existing API.

### Why was this MR needed?

Even though the `groups` API exists, it might still be useful to have an endpoint that tells the namespace type (e.g. `user` vs. `group`), especially if a user has access to a number of different projects.

### What are the relevant issue numbers?

Closes https://github.com/gitlabhq/gitlabhq/issues/9328

See merge request !708

Use entity number for plus sign in push emails

Was doing some testing today and found that both outlook and gmail had issues displaying the html content produced for push emails when a file was added.

This is how gmail shows it:
![Gmail_name](https://gitlab.com/stevenorman/gitlab-ce/uploads/24be115dbae97997bc02e2ec70d9870c/Gmail_name.png)

And this is for Outlook:
![Outlook_name](https://gitlab.com/stevenorman/gitlab-ce/uploads/4b5a54956139d36d78f9c61c83e99928/Outlook_name.png)

iOS devices work with the + entity, as does Mail on OS X, but I'm wondering if it is only available for newer html parsers (a quick browse on the w3c site seems to show that it was added in html 5).

Changing the entity to `+` and both gmail and outlook and iOS and Mail.

See merge request !721

Omit link to generate labels if user does not have access to create them

On a project that has no labels, a user was provided a link to create labels on the "Labels" tab, resulting in a 404. This MR changes the next to "No labels created" if the user lands on this page but does not have permission to add a label.

Screenshot:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/cb04659cf3a0abe1e072cb78d0964b94/image.png)

Closes https://github.com/gitlabhq/gitlabhq/issues/8353

See merge request !752

Trigger hooks create on backup restore

Number of users migrating from installation from source to omnibus get this issue. This can be fixed with a bash one liner but we already have a script that creates hooks in gitlab-shell. Added to gitlab:shell:install task call to `bin/create-hooks`. This script is idempotent which means it will only rewrite hooks if something changed.

Fixes https://dev.gitlab.org/gitlab/gitlabhq/issues/2208, https://github.com/gitlabhq/gitlabhq/issues/9101 and for the most part https://github.com/gitlabhq/gitlabhq/issues/8161

See merge request !762

Added autogenerated .gitlab-ci.yml

See merge request !1839

Remove show actions from Admin and Project DeployKeys

Example styling after:

> ![Screen_Shot_2015-06-03_at_6.04.51_PM](https://gitlab.com/gitlab-org/gitlab-ce/uploads/105801a7e390224066721bba200c4909/Screen_Shot_2015-06-03_at_6.04.51_PM.png)

Closes #1741

See merge request !763

Also style all key fingerprints consistently across the app.

Add 2FA docs

See merge request !757

Group improvements

* remove projects before removing group
* execute all hooks/events from project destroy when group removed
* log group create/remove
* delay remove of namespace directory (to prevent NFS issues)

Inspired by !759

See merge request !761

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

Remove gitlab:env:check task.

Rake task that checks for git user git settings is a leftover from early days.

It is not being used by the web editor(and web editor is also being redone atm) so this rake task just causes confusion.

Adresses internal issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2362

See merge request !758

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

Conflicts:
	spec/features/projects_spec.rb

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

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

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

Conflicts:
	spec/features/projects_spec.rb

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

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

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

LDAP users should not control their LDAP email

If they can, they can take over arbitrary GitLab accounts.

See merge request !1837

Add "Resend confirmation e-mail" link in profile settings

Adds a convenience link to resend the confirmation e-mail if necessary. Before, user had to logout or open an Incognito Window to do this.

Screenshot:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/700e6d98e1c5b58726fbed4e52a09c06/image.png)

Fixes https://github.com/gitlabhq/gitlabhq/issues/9274

See merge request !634

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

Ths commit does next:

* When we remove project we move repository to path+deleted.git
* Then we schedule removal of path+deleted with sidekiq
* If repository move failed we abort project removal

This should help us with NFS issue when project get removed but
repository stayed. The full explanation of problem is below:

* rm -rf project.git
* rm -rf removes project.git/objects/foo
* NFS server renames foo to foo.nfsXXXX because some NFS client (think
* Unicorn) still has the file open
* rm -rf exits, but project.git/objects/foo.nfsXXX still exists
* Unicorn closes the file, the NFS client closes the file (foo), and the
* NFS server removes foo.nfsXXX
* the directory project.git/objects/ still exists => problem

So now we move repository and even if repository removal failed

Repository directory is moved so no bugs with project removed but
repository directory taken. User still able to create new project with
same name. From administrator perspective you can easily find stalled
repositories by searching `*+deleted.git`
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Remove "(unreleased)" from v 7.11.0

More Javascript testing

Continuation of !715

See merge request !736

Push event: Nest link in strong tag, not vice-versa

Closes #1022

See merge request !755

Fixes https://github.com/gitlabhq/gitlabhq/issues/9274

Also removes redundant `unbind` call