YAML to store roles

[e-sp]

Using YAML, it would be much easier to edit the roles with any text editor. Instead of having to edit the role in a JSON file, where the prompt is a single string with escaped newlines, one could do:

name: foo
role: >
  line 1
  still line one

  that's line two here
  and the rest of line two

And it would be easier to read and change.

[e-sp]

Another plus that JSON is a subset of YAML, which means there wouldn't even be a need to migrate from JSON to YAML, since the PyYAML module can load JSON files. The new version would just create new roles in YAML but it'd kept working for both, JSON and YAML.