message: Removing the link to ami.py from aws-py-webserver as we do dynamic AMI lookup
diff: An example based on the Amazon sample at:
  http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/deploying.applications.html. The example deploys an EC2 instance and opens port 80.
  -To get the correct Amazon Linux AMI for the instance size and region, a mapping is defined in [ami.py](./ami.py).
  -
  ## Prerequisites
  1. [Install Pulumi](https://www.pulumi.com/docs/reference/install/)
  