PIM-2185: Move quick export code from Product controller to Datagrid one
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