Provide CLI options to upload to AWS

[garyd203]

There is a non-trivial amount of shell scripting fuss involved in calling ssmash to create a cloud formation template, then uploading that template to cloudformation (with the right parameters), then potentially restarting your ECS service or whatever else.

Add some CLI options to make this process built-in to ssmash. It's within the scope of what we want to do ("make it easy to manage application configuration in SSM Parameter Store"), and would deliver reasonable value.

We don't really want to re-implement the create-or-update semantics of the AWS CLI deploy command, but perhaps see https://github.com/aws/aws-cli/blob/develop/awscli/customizations/cloudformation/deploy.py for a minimal amount of skeleton code we could copy