notificationsVC could crash when group membership changed #620
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Summary
NotificationsVC could crash when the underlying list of goals changed. The MR makes the code more robust by using a diffable datasource for the NotificationVC's TableView.
Also took the opportunity to add the HUD activity indicator when notification settings are being saved.
fixes #397
For UI changes including screenshots of before and after is great.
Validation
Ran app in simulator.
Changed settings in goals. Returned from notification/goal screen back to notification goal list. Noticed goals were in their proper sections.