Make Atom fixture well-formed to spec
Make Atom fixture well-formed to spec

Atom specifications require that all IDs include a URN. Also,
whitespace is not permitted within certain tags. I've cleaned
those up.

Eventually, I'll want less-than-perfect fixtures to ensure that
RSSCache doesn't blow up on less-than-perfect feeds, of which
there are plenty.

trevorparker/rsscache