The EPUB metadata description specifies "role" for creators, not "type":
http://pandoc.org/README.html#epub-metadata
This fixed the two epub templates to use the correct syntax.
Previously we just expected 'title', 'subtitle', 'author', 'date'.
Now we still support those, but also support the format recommended
for epub metadata in the pandoc README:
---
title:
- type: main
text: My Book
- type: subtitle
text: An investigation of metadata
creator:
- role: author
text: John Smith
- role: editor
text: Sarah Jones
identifier:
- scheme: DOI
text: doi:10.234234.234/33
publisher: My Press
rights: (c) 2007 John Smith, CC BY-NC
...
