Give relation ownership to Order
Remove unused repository method
Implement revert on ShippingDiscountAction
Remove unused use statements
Use ResourceDataTransformer

and redude hard dependency
Fix lack of caching in SettingsManager

Currently the SettingsManager does not cache resolved settings,
so multiple requests for settings of the same namespace lead to redundant queries and processing overhead.
Merge pull request #692 from winzou/promotion-revert

[Promotion] Add revert mechanism to promotion actions
Add FreeProduct promotion
Add FreeProductAction specs
Rename promotion and fix feedbacks
Fix typo during rebase
Use new DataTransformer
Add translation
Use VariantRepository to reduce SQL queries
Fix TaxonomyRuleChecker

Items in cart are not inventory units
fix sync request not supported.
Implement revert method
Add easy way to disable inventory tracking.

Currently inventory is always being tracked (resulting in backorders if not replenished).
This PR adds a simple NoopInventoryOperator and a configuration switch.
Merge pull request #852 from Richtermeister/fix-settings-cache

Fix lack of caching in SettingsManager
[InstallerBundle] Don't use deprecated code