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How do you extend an entity in Symfony2 like you used to be able to in Symfony?
namespace AcmeWebsiteBundleEntity;

use DoctrineORMMapping as Orm;

/**
 * @OrmMappedSuperclass
 */
class BaseEntity {

}

namespace AcmeWebsiteBundleEntity;

use DoctrineORMMapping as Orm;

/**
 * @OrmMappedSuperclass
 */
class BaseAuditableEntity extends BaseEntity {

    private $createdBy;

    /**
     * @OrmColumn(type="datetime", name="created_at")
     */
    private $createdAt;

    /**
     * @OrmManyToOne(targetEntity="User")
     * @OrmJoinColumn(name="updated_by", referencedColumnName="id")
     */
    private $updatedBy;

    /**
     * @OrmColumn(type="datetime", name="updated_at")
     */
    private $updatedAt;

    // Setters and getters here
}

namespace AcmeWebsiteBundleEntity;

use AcmeWebsiteBundleEntityBaseAuditableEntity;

use DoctrineORMMapping as Orm;

/**
 * @OrmEntity(repositoryClass="AcmeWebsiteBundleEntityRepositoryUserRepository")
 * @OrmTable(name="acme_user")
 */
class User extends BaseAuditableEntity implements AdvancedUserInterface, Serializable
{
    /**
     * @OrmId
     * @OrmColumn(type="integer")
     * @OrmGeneratedValue
     */
    private $id;

    /**
     * @OrmColumn(type="string", name="first_name")
     */
    private $firstName;

    /**
     * @OrmColumn(type="string", name="last_name")
     */
    private $lastName;

    /**
     * @OrmColumn(type="string", unique="true")
     */
    private $email;

    // Other properties

    // Constructor

    // Setters and getters
}