Fix images on github

Fixes https://dev.gitlab.org/gitlab/organization/issues/55

/cc @job @dzaporozhets

See merge request !1073

Omniauth doc

Fixes #1481

See merge request !1069

Update markdown reference to external issues

change bash to sh in web, background_jobs scripts

Recommend the GitLab Development Kit

See merge request !1067

Use create-hooks instead of rewrite-hooks.sh

The rewrite-hooks.sh script is a deprecated wrapper for gitlab-shell's
create-hooks script.

See merge request !1068

[Documentation] simplify HTTPS setup details

add optional nginx configs to make more secure

add cleanup section to 5.0 upgrade guide

Add cleanup details to upgrade guide as gitolite and more is no longer
used

The rewrite-hooks.sh script is a deprecated wrapper for gitlab-shell's
create-hooks script.

Name it centos

See merge request !1060

add current sign-in date

also adds comment about updating nginx files during upgrades

Prevent graph spacing issue

Switch from travis to semaphoreapp

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

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

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

Added cmake and pkg-config as build dependency for pkgr

Add comment to merge request when new push happens

Fixes #1494

See merge request !1065

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

It allows track when user added new commits to existing merge request
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

added htmlsafe to branch list

change git to git bin path

Delete mailer queue

Show labels help message if last label is deleted

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

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

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