Updated Opsworks to add ELB support & handle the latest parameters.
Added parallel scan support in DynamoDB v2.
Updated Elastic Transcoder with new API options.
BACKWARD-INCOMPATIBLE: Changed ``error_code`` to ``error_id`` to match the DataPipeline API.
Updated the high-level DDBv2 interface to support parallel scan.
Added docs on how to use parallel scan from the high-level API.
Merge branch 'ddb-parallel-scan' into develop
Merge branch 'datapipeline-update' into develop
Merge branch 'ets-update' into develop
Merge branch 'opsworks-elb' into develop
Added release notes for 2.9.3.
Bumping version to 2.9.3
Merge branch 'release-2.9.3' into develop

* release-2.9.3:
  Bumping version to 2.9.3
Started the 2.9.4-dev cycle.
Fixed up a test failure in the DynamoDB suite.