Merge pull request #1 from martingeorg/master

Initial implementation of the AWS DynamoDb driver
Merge pull request #2 from martingeorg/master

Few minor changes
Merge pull request #3 from martingeorg/master

base64_decode fix
Merge pull request #4 from martingeorg/master

Advanced key-value methods
Update README.md

added minimal instructions
Update README.md

added code format
Merged in AdvKvDriver work in progress