Add @Transient as a way to ignore persistence for declared properties.
Add FailedBatchDeleteException to GenericDAO's deleteByIds() method.
Update DAO implementations to throw this new exception.
Add tests.

Update to slf4j 1.7.7
Update to Spring 3.1.2-RELEASE
Update to Mongo Java Driver 2.12.4
Update copyright to current year.
Initial check-in for DynamoDB implementation.