Added support for fitvids.js, enable it in the Video SEO settings to make your Youtube / Vimeo / Blip.tv / Viddler / Wistia videos responsive, meaning they'll become fluid. This might not work with all embed codes, let us know when it doesn't work for a particular one.
Removed the ping functionality as that's fixed within the core plugin.
Added code that forces you to update WordPress to 3.4 or higher and the WordPress SEO plugin to 1.4 or higher to use the plugin.