[acgiowt] (2) Drop <time> and replace it with <data>. Drop the Atom c…

…onversion section entirely. Convert a bunch of examples that used to use <time pubdate> to using schema.org, to show how to annotate publication dates and the like in a machine-processable way.

Fixing http://www.w3.org/Bugs/Public/show_bug.cgi?id=13240

git-svn-id: http://svn.whatwg.org/webapps@6783 340c8d12-0b0e-0410-8428-c7bf67bfef74