Added `lot` and `lof` variables to latex template.

lof = list of figures.
lot = list of tables.
epub3: Put title page in section w epub:type titlepage.
Indicate that the templates are duel licensed, GPLv2+ and BSD3.

Closes #13.
Typo: duel->dual.  (#13)
latex template:  disable protrusion for typewriter font.

Closes #1549. Thanks to lemzwerg.
EPUB, EPUB3 templates:  Handle structured metadata on titlepage.

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
...
Added \VerbatimFootnotes if there is verbatim in notes.

See http://tex.stackexchange.com/questions/203/how-to-obtain-verbatim-text-in-a-footnote

Closes jgm/pandoc#1616.
Merge https://github.com/jgm/pandoc-templates
Relocated several custom templates.