Fix CartRepository->findExpiredCarts()

Fix exception due to varchar field without quotes
[Doctrine\ORM\Query\QueryException]                                            
[Semantical Error] line 0, col 124 near 'cart': Error: 'cart' is not defined.
Merge pull request #1604 from doctormad/patch-1

Fix CartRepository->findExpiredCarts()
[payum] payum does not store details after user is returned from payment.
[payum][action] remove debug.
Merge pull request #1607 from formapro-forks/payum-do-not-store-details-after-returning-back

[payum] payum does not store details after user is returned from payment
Add ROLE_PREVIOUS_ADMIN to allow switch back
Merge pull request #1609 from amenophis/switch-user-bugfix

Add ROLE_PREVIOUS_ADMIN to allow switch back