Changed sudo by su -c

The sudo command needs a tty to run. If you put this file on a CentOS 6, for example, it will not run in the host startup process. Instead, the 'su -c' runs the command apart if it has or not a tty.

I tested this change in a fresh install of gitlab on a CentOS 6.5 with successful.
Update merge_request_observer_spec.rb
Fix another instance of "created at"

Replace it with "created on".

Change-Id: Ibd26bf82d2e64f142a4f3be6da7701e5b035602f
Don't send an email for "mentioned in" notes

Currently, an email is sent every time a mentionable is referenced
by an issue, a commit or a merge request: if I comment "This MR is
related to #5", watchers get one email for the comment, and another
one stating "Issue #5 was mentioned by issue #13".

This is annoying — but the biggest issue is when pushing an existing
branch. Every issue referenced by commit messages in this branch will
get a new mention (which is fine), and dozens of emails will be sent
for all these new mentions (which is not).

This commit fixes the spam by avoiding to send an email when a new
mention is created. In most cases the email notification for the
mentioner is enough.
Update user_management.md

Believe the intention was to say 'groups' instead of 'projects' here.
Database doc changes to address #2412 and #6451.
Fixed Unicorn-Sidekiq confusion in GitLab init script.

There were a few places in the included init script where
Unicorn was referred to as Sidekiq and vice-versa.

This fixes #126.
Deploy key needed documentation.
Split up the lines for Jacob.
Update 6.0-to-6.5.md

A lot of users get authentication errors after this upgrade. Reason being the change in 6.5 that secure cookies when using https. A link to this would be very handy for other upgraders!

https://github.com/gitlabhq/gitlab-public-wiki/wiki/Trouble-Shooting-Guide#cant-verify-csrf-token-authenticitycant-get-past-login-pageredirected-to-login-page
Run the RC on Cloud.
require public email with oauth provider message
line break
Add method to get the comments on a merge request

Add method to get the comments for a merge request and
document that you can change the status of a merge request.
added OReilly sponsorship to CHANGELOG
 Merge branch 'changelog_oreilly' into 'master'

Changelog O'Reilly

added "Better API for access_levels" sponsorship from O'Reilly to CHANGELOG
GitLab requires gitlab-shell v1.9.0

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
 Merge branch 'deploy-key-doc' into 'master'

Deploy Key Doc

/cc @marin @job @jacobvosmaer
 Merge branch 'oauth-require-public-email' into 'master'

Oauth Require Public Email

Does not fix #976 yet, but will reduce the amount of users getting 422 immensly.
 Merge branch 'cloud-update' into 'master'

Cloud Update

/cc @jacobvosmaer @marin @job