Fix incorrect date field input format.

The default input format for date type is `datetime` but we are
expecting a `string`.
Polish composer.json file for CoreBundle

Refs #658
Set random password when creating user using oauth to prevent `null` issue & potential security hole
While using OAuth check first for user with email if any is provided, otherwise check database for given username
Merge pull request #637 from kayue/fix/order-filter-form-input-format

Fix incorrect date field input format in order filter form.
Add Be2bill payment method
Restricted zones, fixes #624
Replace zone restriction listener with approach in item resolver.
Introduced RestrictedZoneChecker, added SyliusRestrictedZoneExtension
RestrictedZoneListener to remove item from cart on address update
Bugfix: Add missing manager call in create user & fix call in connect user at OAuthProvider
Merge pull request #665 from umpirsky/fix/issue-624

Restricted zones, fixes #624
Merge pull request #669 from winzou/be2bil

[Payum] Add Be2bill gateway