Added feed link support to the Atom 1.0 parser.
Fixed a potential bug in de Atom parser where the code was getting all descendant elements when looking for a particular element, in stead of only the child elements of the current element.
Fixed a potenial bug in the RSS 2.0 parser. Same as the Atom 1.0 parser from the previous commit.
Changed retrieving some elements from the Atom 1.0 parser. Instead of asking for all and checking only the first, the code now only asks the first.
Added feed summary parsing to Atom 1.0 feeds .
Made the same bugfixes (as detailed in earlier commits for the RSS 2.0 and Atom 1.0 parsers) to the RSS 1.0 and RSS 0.91 parsers.
Added RSS 1.0 parsing of articles.
Added article parsing for RSS 0.91 feeds.
Added an extra check on some RSS 2.0 element values to see if they are actually present or maybe empty.