Add LogDeliveryWrite canned ACL for S3 bucket

Valid value "LogDeliveryWrite" was missing based on
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-s3-bucket.html#cfn-s3-bucket-accesscontrol
LogDeliveryWrite should be in list of AccessControl types
Update for recent changes
Bump to 0.6.1

Revert previous 0.6.0 since 0.6.0 had already been released.