#16 sort based on publication date

[Katie Bechtold]

FeedOnFeeds-Redux currently sorts entries
chronologically based on 'timestamp', which corresponds
to the time the item was cached in the aggregator,
rather than 'dcdate', which corresponds to the
publication date of the item.

This most noticeably causes a problem when you're
adding new feeds -- their entries are not necessarily
cached in the same order they were published.

[Katie Bechtold]

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Fixed. Also added sort order options. Please test.

[Andrew Turner]

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Looks fixed in RC-0_2.