Added new authors
Documentation and error handling of pagination methods.
Support for attributes in channel elements. This is a possible fix for #18.
Documentation of new method parameter.
Merge branch 'issue-18'
Pagination is now done by internally invoking setAtomLink.

This also makes pagination work with RSS1 feeds. The method parameter for the feed URL itself was removed, because RFC 5005 only specifies the other four link relations. The URL to the feed can be set with the setSelfLink method.