html5lib checking: Undo fixes to bug 98689, undo r81671, r81670 and r81654 because html5lib 1.04 (and 0.90) use 'from six import ....'

(integrated from komodo (trunk) change 81697 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13560 b87d16e7-d29f-4ee1-b5ec-817d645d335f