Add redshift to setup.py/docs index
Added underlying DynamoDB v2 support.
Merge branch 'ddb2' into develop

* ddb2:
  Added underlying DynamoDB v2 support.
Bump version to 2.9.0
Merge branch 'release-2.9.0' into develop

* release-2.9.0:
  Bump version to 2.9.0
Add dev prefix back to version in dev branch
Bumped the version in README.