Use the alternate link in Atom feeds.
Deal with people putting namespaced link elements in their XML.

http://syndication.thedailywtf.com/TheDailyWtf puts atom10:link
elements after the original RSS link element, and the Go parser was
overwriting the rss.Link field with these empty atom10:links.
Make feed page titles a link.

Fixes #69
Merge pull request #90 from eaburns/dev/eaburns

Add links on feed titles