Alphabetical sort json dump
Paths are converted to resource links

Lists of files are converted, as well as 'ref' keys in the data.
Spec usage of 'ref' is to have an object with that single key and the
value to be the path to a resource.

Example:
```
subject:
  ref: subjects/cisc
```
converts to
```
subject: http://my_host_name/subjects/cisc
```