annotation: add @Validated for validated templates.
cloudformation: add StackUtils utility class.
command/workflow: use StackUtils.
command/cloudformation: create-stack should block until stack is up.
command/cloudformation: validate-template: return a @Validated template.
module: run validate-template before create-stack.
main: catch and print AmazonServiceExceptions.
command/cloudformation: delete-stack: block until stack is down.
command/cloudformation: delete-stack args: change --name to --stack-name.
pom: bump AWS SDK version.
template: update test template config.