Removed a lot of the old VPCBase parameters and introduced simpler VPC parameters.
Updated CLI to work with the latest VPC changes.
Adding support for varying cluster users due to multple Base OS support.
Updating AMI mapping to support multple Base OS
Prepping for v0.0.12 release
Merge pull request #14 from awslabs/develop

Develop merge for v0.0.12 release