Fixed processing of atom links without a ‘rel’ attribute.

Atom links that had no 'rel' attribute weren't processed. 

http://tools.ietf.org/html/rfc4287#page-21

4.2.7.2.  The "rel" Attribute

   atom:link elements MAY have a "rel" attribute that indicates the link
   relation type.  If the "rel" attribute is not present, the link
   element MUST be interpreted as if the link relation type is
   "alternate".