#156 Revised DefaultDynamoTest to be more stable
#159 Unit test for verifying object closure
#159 Resource is now Closeable
Merge pull request #174 from carlosmiranda/156

#174: pull request #156 Revised DefaultDynamoTest to be more stable
Merge pull request #175 from carlosmiranda/159

#175: pull request #159 Closeable resources to free up connections to S3