Start breaking settings.html out into individual template files.
Allow subsection customisation.
Add support for multiple template paths, with precedence order.
Don’t try to render the template option on subsections.
Major cleanup of README, add info on templates.
Trailing spaces for newlines in README.
Fix up heading sizes.
Allow overriding of field template without changing its type.
Add template customisation examples.
Add line about custom templates to top of README.
Rename the `includes` option to `templates`.
Proof read README.
Bump version and release v0.4.0.