Add microformats2 gem.
Add webmentions table. #21
Add stubbed webmention model, helpers, views. Add <link> to layout. #21
Save HTML and JSON on webmention verification. Add a TODO note and change Time.now to Time.now.utc on publishable concern. #21
Add polymorphic association between webmentions and content types. Adds webmentionable concern and updates migration. #21
Add get_webmentionable method. #21
Add webmentions to post and link show views, updat webmentionable with useful methods. #21
Account for just about every possible case of missing properties. #21
Add index on :webmention_type. Refactor webmention receiving route. #25 feedback.
Refactor entry_* and author_* methods based on @tpitale's feedback. #25
No need to ||= nil.