Bugfix InventoryHandler to remove units of items that have been removed from the cart.

Currently the inventory handler only adjusts the units of items that are still in the cart,
but when an item is removed from the cart, the inventory unit remains. This PR fixes this.
Take into account multiple items with same variant.
POC of CMF block bundle integration
Reverting a change that broke the tests.
Add other CMF bundles and sample page
PHPCR support for ResourceBundle
Refactoring code to make it easier to follow.
Add basic interface for editing the PHPCR content
Add translations
Tweak fixtures
Add more sample content
Update install command
List the links and change the node paths
Handle phpcr table in travis & install command
Revert the command in travis
Merge pull request #415 from Sylius/symfony-cmf

[WIP] Symfony CMF integration
Add the product filter form to the inventory page
Merge pull request #842 from Richtermeister/bugfix-inventory-handler

Bugfix InventoryHandler to remove units of items that were removed from cart
Nth order rule checker
User loyality rule checker