Looks great, Travis.

One thing: you should consider building this on jed/dynamo-client[1] instead of jed/dynamo. I refactored the former out of the latter last week, adding exponential back-off retry and the ability to specify custom hosts for better testability. Also, I'll be refactoring jed/dynamo myself in the near future, which will introduce breaking some API changes.

    [1] https://github.com/jed/dynamo-client