Add initial cftemplate generator function to cs290.py.
Add 'aws-groups' command to cs290.py.

Also add method to verify cloudformation templates.
Generate most of the webrick single template.
Upload valid templates to S3 and output their URL.
Add cftemplate test-mode by default to avoid overwriting 'working' templates.
Actually upload the template body.
No files in /home/ec2-user should be owned by root.
Complete SingleWEBrick instance as ec2-user template generation.
Update the README for the SingleWEBrick instance.