DynamoHelper: Expose method to create tables

So we can create multiple sets of tables in the same dynamo
instance.
Release 0.2.2

Expose table creation in the DynamoHelper. In some tests
we could need to create multiple sets of tables.
DynamoKV: Support hash/range keys in emptyTables

emptyTable was not updated to the hash/range combined keys
and wasn't working. Fixed and added tests.