Support for DynamoDb Json

[dwhjames]

See http://aws.amazon.com/releasenotes/Java/7291607733354976

[glidester]

I've just been looking into this as I thought it might be useful in my new project. After investigation though I've come to the conclusion that there is no point.

Currently we transform Scala objects -> Map[String, AttributeValue] and back again to persist and retrieve them in Dynamo. It is possible with the (not so) new Json support to transform Json objects -> Map[String, AttributeValue] and back again, but unless we have no requirements for a native Scala representation of the object (unlikely) this serves us no purpose.

If we were prepared to transform Scala object -> Json object -> Map[String, AttributeValue] then we could reduce some boilerplate in the implementations of the DynamoDBSerializer class (see attached) but I don't fancy that trade off with the added performance & complexity hit.

So I suggest we close this issue as "won't implement".
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