Pod Wrangler support

I use Pod Wrangler's webapp hosted on feedwrangler.net to listen to podcasts. The site uses the jquery jplayer, so this extension could pretty easily adapted to a number of websites. All features of Simplify are supported, except for next/previous track because it doesn't really make sense for this site. I have a corresponding PR for simplify_web_suite_core [here](https://github.com/mmth/simplify_web_suite_core/pull/4).