NOTIFPLT-17:  Add an id attribute to the data model for an action;  specifying it is not required, since it defaults to the simpleName of the concrete implementing class
NOJIRA:  Refactor INotificationService.fetch and INotificationService.isValid to take a PortletRequest (instead of a ResourceRequest) because we will need to have access to the collection of notices in other phases
NOJIRA:  Whitespace cleanup
NOJIRA:  Add a NotificationResponse.findNotificationEntryById method
NOTIFPLT-17:  Add an @ActionMapping handler method for invoking actions on notifications
NOTIFPLT-17:  Add necessary actions support to the JavaScript component
NOTIFPLT-18:  Add an optional, alternate simple-list view that displays notices in a flattened, vertical list