[Domains] Fix 9gag photos
[Domains] support CNN's www domain videos too
[Domains] Twitpic now supports videos
[Domains] Allow older GitHub Gists (without title and alpha-numerics)
[Domains] YouTube - allow URLs of embed players
[Domains] Forgot to list Kinja in Gawker plugin
[Domains] Imgur now supports oEmbeds + proper embeds for galleries
[Domains] Cover more URLs on ec.europa.eu
[Generic] fix whitelisted twitter.photos when src is taken from og image