Update Irker home page

[ci skip]

Closes #1713

See merge request !812

[ci skip]

Closes #1713

Update noteable after a new note is added

Update Redcarpet to 3.3.0

Fixes #1432

See merge request !809

Prepare specs for RSpec 3

See merge request !811

Fixes #1432

Ensure `session_expire_delay` field exists before accessing it

Closes #1798

See merge request !808

Closes #1798

Add info about regex anchors to shell command docs.

Addresses internal issue https://dev.gitlab.org/gitlab/gitlab-ee/issues/263.

See merge request !805

Add session expiration delay configuration through UI application

Setting is accessible by the administrator through the UI and defaults to 1 week (the current setting)

Answers the following suggestions:

  * http://feedback.gitlab.com/forums/176466-general/suggestions/6210719-make-session-length-configurable
  * http://feedback.gitlab.com/forums/176466-general/suggestions/6730512-automatic-logout-after-a-time-being-idle

See merge request !774

Add 7.12 update guides

See merge request !1858

Fix typo on account page.

@douwe Thanks for reviewing this small fix.

See merge request !1854

Update install docs for 7.12

See merge request !1857

Even though the 7-12-stable branch does not exist yet.

Git 2.1.2 does not protect against pushes trying the '.Git/config'
attack (CVE-2014-9390). Going to 2.4.3 is perhaps a big jump but why not
use the latest? (Famous last words.)

Remove text since rss is now to prominent.

See merge request !1855

Fix link to howto_rc1.md

The relative link that was there before breaks when you copy-paste the
issue template into an actual issue.

See merge request !1856

The relative link that was there before breaks when you copy-paste the
issue template into an actual issue.

Prepare feature steps for RSpec 3

See merge request !803

There's a naming conflict between Capybara and rspec-matchers which both
define the `all` method.

See https://github.com/jnicklas/capybara/issues/1396

Add a note that changing example configuration files requires changing omnibus-gitlab.

Keeping track of changes in these files is not easy and they usually require change in omnibus-gitlab.

Added a note so everyone is aware of this.

Similar is added to gitlab-shell and gitlab-ci.

Discussed in gitlab-org/omnibus-gitlab#605

See merge request !800

Refactor accept merge request widget

* make each case a simple view
* separate  merge request JS from merge request accept widget JS
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !799

Fix graph width on different screen sizes
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !802

Make commit calendar size depend on window size
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !801

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

Add negative tabindex to Markdown Write and Preview tabs

Closes #1757

See merge request !796

An `in_namespace` scope is already present