Refactor meta handling in SiteBuilder, return PageData instance
Refactor meta handling in SiteBuilder, return PageData instance

quickliketurtle/jigsaw,adamwathan/jigsaw,tightenco/jigsaw,quickliketurtle/jigsaw,tightenco/jigsaw,adamwathan/jigsaw,quickliketurtle/jigsaw,tightenco/jigsaw