Use options passed to putItem

[jimlambie]

Currently the options passed to putItem() are not used. I would like to pass ReturnValue: 'ALL_OLD so that DynamoDB responds with the inserted data.

https://github.com/victorquinn/dynasty/blob/master/src/lib/aws-translators.coffee#L148-L154

I'd be happy to send a pull request if you're interested. Thanks!