Fix extra root tags being added by lxml
use lxml.html.tostring as a backup if stripping root element fails
use lxml.html.tostring as a backup if stripping root element fails for teasers
Merge pull request #1264 from dhruvbaldawa/lxml-root-tags

Fix extra root tags being added by lxml
resolve #1164 -- remove tidy.

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>