PIM-2141 : add product datasource
PIM-2141 : simplify orm datasource
PIM-2141 : use pim_product datasource for any product grid
PIM-2141 : update filter extension to make it useable for orm and
product datasources
PIM-2141 : update pager extension
PIM-2141 : update selector extension
PIM-2141 : update sorter extension
PIM-2141 : simplify flexible grid listener
PIM-2141 : update add parameters listener to make it useable for orm and product
datasources
PIM-2141 : update changelog
PIM-2141 : move constants from pim_orm to pim_product datasource
PIM-2141 : fix column configurator
PIM-2141 : fix filter configurator
PIM-2141 : fix sorter configurator
PIM62141 : fix context configurator
PIM-2141 : fix group column configurator
PIM-2141 : remove useless setQueryBuilder method
PIM-2141 : move product grid configurators from
DataGridBundle/Datagrid/Flexible to DataGridBundle/Datagrid/Product and
update references
PIM-2141 : rename configure flexible grid listener and update references
PIM-2141 : enable mass action for other datasources (not only orm)