Tests needed: aggregator.pages.inc

This information is from the code coverage report (see http://coverage.cwgordon.com/coverage).

We need to test:

1) aggregator_page_last()
2) aggregator_page_category()
3) aggregator_feed_items_load() with actual feed items.
4) Categorization of aggregator feeds.
5) Display of actual aggregator content when we actually have feed items.
6) aggregator_page_sources()
7) aggregator_page_categories()
8) aggregator_page_rss()
9) aggregator_page_opml()
10) Checking feed sources more than once.