PIM-3363 : provide interfaces to normalize managers
PIM-3363 : normalize attribute and option manager

Conflicts:
	src/Pim/Bundle/CatalogBundle/Manager/AttributeManager.php
PIM-3363 : normalize attribute manager
PIM-3363 : rename updater and bulk updater interfaces
PIM-3363 : normalize attribute group manager
PIM-3363 : product manager now implements remover interface
PIM-3363 : normalize association type manager
PIM-3363 : normalize category manager
PIM-3363 : category manager implements saver interface
PIM-3363 : normalize the datagrid view manager
PIM-3363: implement saver and remover interfaces for managers
PIM-3363 : fix datagrid view remove method
PIM-3363 : normalize association type handler
PIM-3363 : normalize exceptions
PIM-3363 : normalize exceptions
PIM-3363 : normalize comment manager
PIM-3363 : fix handlers and missing saves
PIM-3363 : fix cs
Merge pull request #1754 from akeneo/normalize-managers

PIM-3363 : Normalize managers
PIM-3364 : normalize form handlers