Added Embed.ly API Key setting
Added Embed.ly Content Provider
Fixed imgur content provider to not return bad results on albums
Added support for delayed content provider results

This is so results that require HTTP requests (embed.ly) can be delayed until after it is determined
that it is the best content provider result (as a result of weight ordering)
Added 'video' and 'link' types to Embed.ly Content Provider
Merge branch 'feature/embedly' into dev