Initial product association grid implementation
Merge branch 'master' into PIM-1265
Merge branch 'master' into PIM-1265

Conflicts:
	src/Pim/Bundle/CatalogBundle/Entity/Product.php
Merge branch 'master' into PIM-1265
Fix product association datagrid to display proper association state
Merge branch 'master' into PIM-1265
Fix case
Merge branch 'master' into PIM-1265
Create form type for product association
Merge branch 'master' into PIM-1265
Added missing associations to product and allow having many products for
one association type
Fix error in AssociationRepository
Fix mapping, restore the grid
Fix grid association query
Change join table name
Change the form to display hidden identifier fields
Merge pull request #383 from akeneo/PIM-1265-proposal

Pim 1265 proposal
Add a subscriber to bind productassociation targets
Fix case when no associations exist
Merge branch 'master' into PIM-1265