Branch 2.0 not synced

[gimler]

see sonata-project/SonataAdminBundle#737 (comment) the templates are missing so it throws the exception

exception:

Object of class DateTime could not be converted to string

admin class:

        $listMapper
            ->add('createdAt', 'datetime')

entity class:

    /**
     * @var datetime $createdAt
     *
     * @ORM\Column(name="created_at", type="datetime")
     * @Gedmo\Timestampable(on="create")
     */
    private $createdAt;

[andrewtch]

bump.

[rande]

seems to be a SonataAdminBundle issue