provision IAM credentials for S3 access
update knife config to enable cloudformation IAM capability
[cloudformation] move chef user data into a registry item
[cloudformation] update chef metadata registry to retrieve encrypted data bag secret from s3
[cloudformation] whitespace
[cloudformation] change base bucket name to match existing bucket naming style
[cloudformation] add instance iam metadata to registry
[cloudformation] update launch_configuration dynamic to use iam metadata from registry
Merge pull request #3 from signifyd/feature/cloudformation-s3

Cloudformation Enhancements