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Douwe Maan d5c715c9cc Merge branch 'lock_for_issuable' into 'master' 
Optimistic locking for Issue and Merge Requests

## What does this MR do?

It implements Optimistic Locking http://api.rubyonrails.org/classes/ActiveRecord/Locking/Optimistic.html for Issues and MRs but in a bit custom way. We use it for cases when either title or description field is involved in the change.

## Why was this MR needed?

We have to prevent data losing.

## What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/issues/12940

## Screenshots (if relevant)

![Screen_Shot_2016-07-09_at_15.33.02](/uploads/2efbe547a12fda93bce347fa711438d7/Screen_Shot_2016-07-09_at_15.33.02.png)


See merge request !5146
 		2016-07-12 17:52:51 +00:00
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admin
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ci
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concerns
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dashboard
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explore
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groups
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import
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oauth
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profiles
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projects
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sherlock
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abuse_reports_controller.rb
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application_controller.rb
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autocomplete_controller.rb
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confirmations_controller.rb
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dashboard_controller.rb
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emojis_controller.rb
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groups_controller.rb
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health_check_controller.rb
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help_controller.rb
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invites_controller.rb
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jwt_controller.rb
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namespaces_controller.rb
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notification_settings_controller.rb
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omniauth_callbacks_controller.rb
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passwords_controller.rb
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profiles_controller.rb
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projects_controller.rb
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registrations_controller.rb
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root_controller.rb
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search_controller.rb
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sent_notifications_controller.rb
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sessions_controller.rb
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snippets_controller.rb
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uploads_controller.rb
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users_controller.rb
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