typed_record support
fix delete_hash_key to handle binary range keys
Return the HMAC - there is no crypto:sha/2
Merge pull request #69 from ksquaredkey/upstream

Return the HMAC - there is no crypto:sha/2
Add SQS Long Polling
Revert include to upstream form
Merge pull request #70 from ksquaredkey/sqs-long-poll

Sqs long poll
Merge pull request #68 from talko/typed_record

DynamoDB: fix delete_hash_key and typed_record support
Merge remote-tracking branch 'upstream/master' into retry_params