Expire Rails cache entries after two weeks

This should help prevent endless Redis growth.

See merge request !1903

Added note about chef

Added note about chef being required to generate GitLab config. because of tweet https://twitter.com/grahamgilbert/status/621015318442459136

See merge request !982

Added new doc about creating a new branch

Added new document about creating a branch and fixed bullets in all the other documents. Also fixed "git push REMOTE BRANCH".

See merge request !1894

Document should start from h1 title. Also put badges on top for easier tracking

Looks much better with new project page design. 

See merge request !983

Time ago fix for branch compare page

https://dev.gitlab.org/gitlab/gitlabhq/issues/2508

See merge request !1904

This should help prevent endless Redis growth.

Remove author information from "post" in merge_requests API.

api: expose work_in_progress flag

See merge request !948

Fix docker image

See merge request !979

This reverts commit 8a01a122.

fixed notifications title

I fixed the title and link to this document because I believe that it's more clear and easier to find if it has "emails" in the name.


See merge request !1897

Fix path to move_drop_indexes.ed

Small documentation fix.

See merge request !1900

Add nice scroll for sidebar
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !978

Hide scrollbar from sidebar when external mouse is connected to OSX

See merge request !977

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

create update guides for 7.13



See merge request !1899

Move coverage-related setup back to spec_helper

These tools must be loaded before our regular Rails environment.

Partially reverts 57830201

See merge request !976

Add 'ed' step to mysql-to-postgres procedure

This change brings the documentation in this repo up to date with that in https://github.com/gitlabhq/mysql-postgresql-converter .

See merge request !1896

Fix mentions not being created upon issue/merge request update

New cross-references weren't being added when they were made in an issue or merge request update.

This happened because the relevant `UpdateService`s were making the `notice_added_references` call
after the model had already been updated and saved, so the `changes` attribute was empty and no
cross-references were made at all.

This fixes the bug and adds a bit of testing and a bit of refactoring.

Closes #1773

See merge request !974

Allow user to specify content he wants to see on project page

Improvement to !938. Since a lot of people complain on fact they don't like to see README.
Especially since we already have a switcher for dashboard - it kind of acceptable to select behaviour.

User can specify which content he/she wants to see:

![Screenshot_2015-07-13_18.24.31](https://gitlab.com/gitlab-org/gitlab-ce/uploads/d237474e8f52df4a62ba7e951fa28bd8/Screenshot_2015-07-13_18.24.31.png)

![Screenshot_2015-07-13_18.24.36](https://gitlab.com/gitlab-org/gitlab-ce/uploads/473b0e2a94b3de16d048b8332b539816/Screenshot_2015-07-13_18.24.36.png)

cc @JobV @jacobvosmaer @marin @sytses

See merge request !970