Twenty Fourteen: remove a todo.

git-svn-id: https://develop.svn.wordpress.org/trunk@26019 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fourteen: add Audio post format support. Props celloexpressions, closes #25807.

git-svn-id: https://develop.svn.wordpress.org/trunk@26020 602fd350-edb4-49c9-b593-d223f7449a82