PIM-1568 Fixed referenced collection specs
PIM-1568 Created the "entities" ODM type
PIM-1568 Convert collection of entities to an array of identifiers
PIM-1568 Renamed ODM custom type
PIM-1568 Fixed php doc
PIM-1568 Introduced the ODM entity type
Merge branch 'master' into pim-1568

Conflicts:
	src/Pim/Bundle/CatalogBundle/Doctrine/ReferencedCollection.php
PIM-1568 Dropped ODM specs if mongo ext is not installed
PIM-1568 Spread usage of ODM custom types "entity" and "entities"
PIM-1568 Improved ODM custom type "entities" exception message
PIM-1568 Skip ODM spec when mongo ext is not loaded
Merge pull request #839 from akeneo/pim-1568

PIM-2189 Mongoize the PIM
PIM-2127 : inject product storage in datagrid configuration
PIM-2127 : disable ORM selector extension for Mongo (will be re-enable
when this extension will be storage agnostic)
Prevented loading ODM custom type if registry is not available
PIM-2131 Updated changelog
Prevented to break travis build when example is skipped
Merge branch 'master' into mongo/disable_selector_extension
Merge pull request #845 from akeneo/mongo/disable_selector_extension

Temporary disable selector extension for Mongo (MongoDB support)
PIM-2127 : update MongoDB hydrator (to fix the attribute property change
from attributeId to attribute)