Add Playbook to create new EC2 instance

This playbook doesn't give any more functionality than could already be done by using the Boto library. However, it is nice to have a standard format for the EC2 instance creation. This instance will always be micro and the Amazon Linux (CentOS) distro. This instance can also be upgraded (to a larger size), updated, etc.
Merge pull request #3 from glenjarvis/add_new_ec2_instance_playbook

Add Playbook to create new EC2 instance