Code review comment for lp:~wallyworld/lazr.restful/propogate-notifications

OK, I'm convinced that there's no simpler solution right now than JSON-encoding the notifications and putting them in a single header. The implementation looks good as well.

The only suggestion I can make is that you should be able to put a single _processNotifications() call in WebServicePublicationMixin.callObject(), instead of calling it from within every implementation of __call__. This would centralize the notification code so it's only called once, and it would also put it 'outside' of the resource processing, in the request processing. This fits nicely with the way we moved the notifications themselves 'outside' of the resource representations and into the HTTP response.