Version bump: 0.7.0
Version bump: 0.7.0

Major changes:
- boto3 support for cloudformation and credentials
  - CloudFormation tag updates now supported
- stack.params_json and params_yaml are now optional
- stack.stack_policy for CloudFormation policy
- stack.role_name for CloudFormation RoleARN
- roles can now be specified as shorthand, or full arn
- {:config_dir} to get config_dir path was defined in

realestate-com-au/bespin,realestate-com-au/bespin,delfick/bespin,delfick/bespin