Fixed problem with initializing the system repository after the
everest_nosql plugin was moved out.
Added truncating logging formatter to cope with excessive log output
messages.
Extended the everest commit veto to allow explicit vetoeing (similar to
the standard pyramid_tm commit veto).
Small improvements in the representer configuration context.
Changed the modifying view class to truncate the request body log.
Introduced catch-all exception for getting a result from a representing
resource view.
Added a "query_class" option to the RdbSession.query method to enable
clients to revert to the default SA session behavior by using the
default Query class from SA.
Fixed the testing rdb context manager.
Extended the FunctionalTestCase class.

Added functionality to create tetst objects.
Commit veto fixes.
Improved doc string for new query class feature in rdb session.
Made the rdb session use SA's merge to implement update.
Cosmetic test fix.