Add trailing slash to normalized absolute URLs in parsed JSON

[jgarber623]

Referencing this conversation in #microformats, I've added trailing slashes in parsed JSON for absolute URLs of type http://example.com.

For example, http://example.com would normalize to http://example.com/. This should conform with URL parsing libraries (e.g. the Addressable Ruby gem) and similar specs (e.g. IndieAuth user profile URLs).

The relevant language from microformats2-parsing:

return the normalized absolute URL of the gotten value, following the containing document's language's rules for resolving relative URLs (e.g. in HTML, use the current URL context as determined by the page, and first element, if any).

It's a small but significant change, so feedback is greatly appreciated. Thanks!

[jgarber623]

There wasn't a lot of support for this in IRC/Slack, so… closing!