Notifications: Nuking WPTableViewController

Closes #2856

/cc @aerych WPTableViewHandler's api is beautiful. Thanks for that!

This *should* be okay, but it makes me a little nervous, mostly because its not clear what else `UITableViewController` might do to a `UITableView` behind the scenes.  As long as the datasource and delegate stay with `WPTableViewHandler` its probably fine.