fix: create a PopulatedFeedItem, not a FeedItem, in the FeedAggregator
fix: create a PopulatedFeedItem, not a FeedItem, in the FeedAggregator

FeedItem is now an interface.

weierophinney/mwop.net,weierophinney/mwop.net,weierophinney/mwop.net,weierophinney/mwop.net