Are transactions supported? #96
Description
The README doesn't make any mention of DynamoDB transactions. Is support for transactions available? (Or planned?)
For me, getting started using DynamoDB using the AWS SDK directly, transactions have been by far the biggest pain point because (a) the JSON format for describing a transactional operation is not the same as the JSON format for describing the equivalent non-transactional operation, and (b) the error reporting provided by the SDK for transactional operations is generally much poorer than the error reporting for equivalent non-transactional operations.
Having API consistency and error reporting parity for transactional and non-transactional operations would be a huge incentive for me to adopt this package; not having support for transactions, on the other hand, is pretty much a show stopper.