sartak/Announcements — pull request #2 by pdcawley (2011-10-14 16:29:23+00:00)
Title: Added a dirt simple unsubscribe mechanism

Possible next steps include:

* Not adding a subscription if it's already in the subscription registry
* Adding a 'once' option to make a subscription auto delete from its registry
* Letting a subscribing object unsubscribe from announcements without having to muck about holding onto mementos like the subscription object.