Merge branch 'release/1.0.8' into develop
Change permitted manager and generic object detail so staff can preview unpublished content
Fix umask
Aggregate total comments and likes onto  to prevent expensive queries.
Handle subclasses of Comment in signal
Do a better job of caching comment count in the header
Do not assume the presence of a request
Prep for release
Merge branch 'release/1.0.9'