Heat/YAMLTemplates

The CloudFormation template syntax is based on JSON. This has shortcomings for templates maintained by hand, most notably:

• lack of support for block (multi-line) strings
• lack of commenting syntax (useful for documenting templates, and commenting out disabled sections).

So that Heat is not held back by this design decision, a new template format is proposed which will be supported alongside the existing CloudFormation format.

This format will be a YAML based syntax.