Bug 1030996 - Add in tool notifications

This is a draft for feedback
IMO you should close these tasks when the event that forces them to be closed happens, rather than when checking to see if the user should be told. Otherwise 1) Numbers on things like open tasks across the service will be skewed, and 2) Anything you add in the future that interacts with tasks and doesn't involve a user browsing the website could be working on invalid tasks since they haven't been closed yet.