Summary:
* Moved the remaining `->save()` calls into editors
* for the `PonderQuestion`, separate `attachRelated` (needed for
indexing and viewing) from `attachVotes` (needed for viewing
but not indexing)
* Update the indexer to include comment and answer content
in the search index.
Test Plan:
Stuff works as before. Also: add a comment or answer with some
easily-identifiable text and search for it; observe that
it gets indexed appropriately.
Reviewers: epriestley, nh, vrana
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T1869
Differential Revision: https://secure.phabricator.com/D3654