Issue 492 - Add nextToken to paginated REST feeds

Added nextToken to:
 * Content comments
 * Discussion members
 * Discussion messages
 * Group members
 * User memberships
Added a nextToken to activity streams.
Switched the startMatched and nextToken paramer in runPagedColumnQuery
Wrapping the output of getRevisions in a `results` and `nextToken`.
Merge branch '492-add-nextToken-to-paginated-feeds' of git://github.com/simong/Hilary into 492-add-nextToken-to-paginated-feeds
Comment fixes