expand the list of built-in mapped CURIEs to include business, event, fitness, product, restaurant
allow early declaration of non-article single post OG type. map post format image and video to OG object type photo and video.other respectively. move article properties builder to a separate function. include attached videos for OG type video.other. include attached MP3s for post format audio
document facebook_og_type filter
Merge pull request #461 from niallkennedy/ogp

Add OG object type filter. Map built-in post formats to OG global type equivalents. Attach audio and video