[MERGE THIRD] Use smartdown version with markdown public API

Update smartdown version with the changes to the api - returning markdown instead of html.

We may want to hold off merging this and bump to 0.11.2 instead as that version has a couple of bug fixes (although I do not think they are manifested anywhere in smart-answers), we would need to create a separate version bump commit anyway)
I was just confused by two different access patterns to the exact same thing, it's worth cleaning up. This isn't Perl, after all.