Order keys for s3#96

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iJJi:OrderKeysForS3

Commits on May 9, 2017

extend tests to use item with a range key.
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always order DDB keys by name when hashing for S3 storage. fixes #90. see previous commit 0c065a5bb4fe1beccc446f0549606871a2ea5a51 for tests which this commit allows to pass
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