Ensure db object read preferences are set to primary when saving changes
Fixed perms
Removed public readPrefs methods, updated unit test
Fixed perms
Merge pull request #26 from talis/TENT609-MakeTripodSavesSetDbReadPreferenceToPrimary

90% - TENT-609 Make tripod saves set db read preference to primary
Merge branch 'master' into less-pessimistic-cache-invalidation