Fork to group

Fixes #1592

* project can be forked into group
* fork link always lead to fork page where you select namespace where to fork

See merge request !1253

Updated documentation for 7.5 release

Documentation for 7.5 release has been updated. Changes include:

- Pointed Ruby version in guides to 2.1.5
- Pointed gitlab-shell version in guides to 2.2.0

See merge request !1259

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

Conflicts:
	CHANGELOG

Update changelog

See merge request !1258

remove duplicate time zone entry in CHANGELOG

fix backup rake task

remove extra cd command

Run 'GC.start' after every EmailsOnPushWorker job

This change removed a lot of large peaks of the Sidekiq memory growth graph on gitlab.com.

See merge request !1257

Update gitlab_git to 7.0.0.rc11

See merge request !1256

Gitlab.com uses special packages, build them first

See merge request !1255

Author attributes clean

See merge request !1254

Strip tags from branch name

See merge request !1251

* Show namespace thumbnail differently if project was already forked
* Show loading spinner when click on fork
* Fork link navigates to personal namespace only if no manageable groups exists
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

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

Update changelog

See merge request !1252

Now you can fork project into group or personal namespace.
Also I moved fork logic from ProjectsController to own fork resource
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

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

Merge branch 'prepare-fork-to-given-namespace' of https://gitlab.com/bkaindl/gitlab-ce into bkaindl/gitlab-ce-prepare-fork-to-given-namespace

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

Fix for #8271: Correctly restore empty repositories.

If a project is being restored, but there is no bundle file, the project was
empty when it was backed up.  In this case, just use git init --base to create a
new bare repository.

Actions in the inbox

Related to #1607

See merge request !1247

RAM Requirements update

512MB of RAM is not enough to install using omnibus-gitlab.

Installation will fail in very random places.

Manual installation might also fail with this low amount of RAM.

See merge request !1249

Performance improvements

Push 1k commits cause 1k sql queries to collect commit author. But this variable was used only in 20 commits (from 1000).
So we did 980 sql queries without using it. This MR fixes it.

See merge request !1250

fixes the `block_removed_ldap_users` rake task

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

Custom git hook documentation