Merge pull request #510 from magento-nord/develop

Bugs
- MAGETWO-56862 [Github] Saving Product does not update URL rewrite in Magento 2.1.0 with single-store mode #5929
- MAGETWO-55935 [Bundle product] Cannot configure bundle product in order editing(admin panel)
- MAGETWO-55849 Customer can be deleted without Merchant permissions verification
- MAGETWO-57118 [github#6201] Form key shared between admin and frontend
- MAGETWO-57989 Unable to create custom image attribute in category
- MAGETWO-55395 Custom address attribute not appearing on Checkout summary
- MAGETWO-59240 There is no WHERE claus for retrieving Media Gallery Data