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-2185: Move quick export code from Product controller to Datagrid one
PIM-1568 Spread usage of ODM custom types "entity" and "entities"
PIM-1568 Improved ODM custom type "entities" exception message
PIM-2185: Move export action to datagrid controller
PIM-2190: Clean phpdoc
PIM-2190: Clean use statements
PIM-2190: Add php documentation for class
Merge pull request #842 from akeneo/PIM-2185

PIM-2185: Move quick export code from Product controller to Datagrid one
PIM-2127 : add ParameterizableInterface to change the datasource query
builder parameter injection
PIM-2127 : datasources now implement ParameterizablInterface
PIM-2127 : change the add parameters to grid listener to avoid to set
parameters in the query builder and just add them in the datasource
PIM-2127 : pager extension get parameters from datasource and inject
them in the pager