Don't try to load a specific group for GroupsController#autocomplete action

Fixes #286.

This was introduced by gitlab-org/gitlab-ce!2614.

### With the fix

![Screen_Shot_2016-02-17_at_15.47.46](/uploads/8c2399e8b61807be8ded9a780b98d39a/Screen_Shot_2016-02-17_at_15.47.46.png)

See merge request !186

Fixes #286.

CE upstream



See merge request !185

Added support for configuring Pages CNAME and TLS Certificates

Preliminary implementation with all expected features that will ship with this feature.

What is supported:

- Multiple domains per-project
- One certificate per-domain
- Validation of certificate
- Validation of certificate chain (solves a problem with missing intermediates)
- Validation of private key against certificate
- Support for Pages Daemon (the shared/pages/group/project/config.json) that will be read by daemon

Plans for enhancements:

- [x] Write behavior and unit tests
- [x] Make the UI nicer

/cc @grzesiek @DouweM @sytses @rspeicher @marin @jacobvosmaer

See merge request !173

[Award Emoji]: sporadic spec fix



See merge request !2833

This reverts commit 0bb6c63b19f3574735838190b415a8b37eca3900.

This reverts commit 1e4f43e854b3dda901ee6d3469153ea72c75959f.

1. PagesController is used to show all domains and general overview of Pages
2. PagesDomainsController is used to manage pages domains

fix table in doc/ci/variables/README.md

The table was missing a column separator, causing GitLab to render the
markdown incorrectly.

[ci skip]

See merge request !2840

Fix Redis installation guide



See merge request !2839

[ci skip]

Sidebar fixes

Fixes #13215 

* when editing a dropdown, but not changing anything you end up in an ugly state
* the hover-over state for the subscribe and other buttons are veeery subtle
* the collapse button needs some sort of hover-over state
* the reference gets shortened. It always got shortened. Not an issue with this in particular.
* the minimized sidebar is not functional. The copy button doesn't do anything
* looks all funky in safari (not for me)

See merge request !2736

CE upstream



See merge request !183