[giowt] (1) Add <meter> to microdata, and <meter> and <progress> to the table sorting algorithm.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=22274
Affected topics: HTML, Microdata

git-svn-id: http://svn.whatwg.org/webapps@7966 340c8d12-0b0e-0410-8428-c7bf67bfef74

Author:    ianh <ianh@340c8d12-0b0e-0410-8428-c7bf67bfef74>