Add rule set for 'provider' name

[pocmo]

Embed.ly returns a provider name: http://docs.embed.ly/docs/extract

That's something we want to use in the mobile UI of Activity Stream (if available). Also see mozilla/page-metadata-service#90.

Some potential sources are:

Meta tags

• Open Graph (og:site_name)
• application-name
• twitter:site (Actually the twitter account, but sometimes a good fallback title)
• al:android:app_name
• al:ios:app_name
• apple-mobile-web-app-title
• twitter:app:name:iphone
• twitter:app:name:ipad
• twitter:app:name:googleplay

Other tags:

• title of tag for RSS/ATOM feeds (Not always the best title or very feed specific)
• title of tag for OpenSearch (Sometimes search specific)

Secondary resources:

• Web App Manifest (name, short_name)
• RSS Feed: channel:title
• ATOM Feed: atom:title

[jaredlockhart]

Tagged and published in 0.5.2