Qualify "this specification" with "this version"

As discussed on public-webapps, the text about the spec being obsoleted needs to be qualified with "this version". See <http://lists.w3.org/Archives/Public/public-webapps/2014AprJun/0825.html>.
Merge pull request #17 from AFBarstow/patch-2

Qualify "this specification" with "this version"