Install gitlab-shell 2.6.8 in installations from source

[ci skip]

See merge request !1932

Update CI quickstart guide

This includes fixes suggested by @axil 

Fixes #3260 

See merge request !1755

Add ignore whitespace change option to commit view

* Remove references to enabling CI since it it will be deprecated
* Revert changes in yaml/README.md, refine it in a separate MR

Fire update hook from GitLab

https://gitlab.com/gitlab-org/gitlab-ce/issues/3069

See merge request !1882

[ci skip]

See merge request !1916

Rails update to 4.2.4

https://gitlab.com/gitlab-org/gitlab-ce/issues/2694

See merge request !1902

Simplify `build_gitlab_shell_ssh_path_prefix`



See merge request !1928

Show Gmail actions links only on expected set of emails



See merge request !1901

Fix Error 500 when viewing user's personal projects from admin page

This is a regression introduced in 4d7f00fd.

Closes #3680

Closes https://github.com/gitlabhq/gitlabhq/issues/9861

Closes gitlab-org/gitlab-ee#90

See merge request !1909

Add clipboard button for project clone panel

Closes #3585 

Project:

![Screen_Shot_2015-11-24_at_7.34.04_PM](/uploads/8bf73a2816f2525896023c36aea402bc/Screen_Shot_2015-11-24_at_7.34.04_PM.png)

Wiki:

![Screen_Shot_2015-11-24_at_7.34.43_PM](/uploads/ddf400a1c979a1d8b535a34877cd6163/Screen_Shot_2015-11-24_at_7.34.43_PM.png)


See merge request !1896

Bump jquery-turbolinks to ~> 2.1.0

See #2857

See merge request !1922

Use new phantomjs source

Version 1.9 was removed from upstream [Debian repos](http://ftp.de.debian.org/debian/pool/main/p/phantomjs/) so I [used fpm](https://gitlab.com/axil/phantomjs-debian) to build our own Debian packages.

Fixes #3722

See merge request !1924

https://gitlab.com/axil/phantomjs-debian

* Version 1.9 was removed from upstream Debian repos

Remove reverence to satellites

Remove reference in backup docs

See merge request !1923

Update public access documentation



See merge request !1837

See #2857