Schema.org markup for octopress

Additional info: I've removed "pubdate" because it's obsolete (check 1c0d9cff814362388f0adf433cdb5efdb07a1e45) and rel="full-article" because it's not included in [any standards](http://microformats.org/wiki/existing-rel-values#HTML5_link_type_extensions "existing rel values · Microformats Wiki").