Merge bounce cleanup branch. This is a major cleansing and refactoring of the

bounce processor.  Note that one thing this does not do is implement any of
the policy around bounce scores.  It "merely" cleans up all the crud in the
BounceRunner, and all the logic around registering bounce events.  This means
the bounce runner can actually be enabled again.  More code needs to be
written to process bounces events occasionally.

Details:

* maybe_forward() moved to app/bounces.py, and it can now discard the
  message, forward it to the list administrators (moderators + owners), or
  site owners.  See UnrecognizedBounceDisposition.
* scan_message() always returns a set of addresses.
* The DSN bounce detector is cleaned up.
* An IBounceProcessor utility is added.
* IBounceEvents are added, with database support.
* bounce_unrecognized_goes_to_list_owner -> forward_unrecognized_bounces_to
* bounce_processing -> process_bounces
* ReopenableFileHandler.filename is exposed as a public attribute.  This aids
  in testing.
* Fix the signature of UserNotification.__init__() to be more PEP 8 compliant.
* Change the OwnerNotification.__init__() signature to take a roster object
  instead of `tomoderators`.  When the roster is None, the site owner is used
  instead.
* Fix the default style setting; s/personalization/personalize/
* BounceMixin is gone, baby gone.
* Add tests for the OutgoingRunner.
* make_testable_runner() can now take a predicate object, which can change how
  often the runner goes through its main loop.  Use this e.g. to go through
  only once when a message does not get dequeued.
* A new LogFileMark helper for testing messages to a log file.

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