Fix Atom feed permalinks

[veganstraightedge]

This:

<link>http://blog.atom.io/2014/03/03/styling-hyperlinks.html</link>
<guid isPermaLink="true">http://blog.atom.io</guid>

should be:

<link rel="alternate" type="text/html" href="http://blog.atom.io/2014/03/03/styling-hyperlinks.html"/>
<guid isPermaLink="true">http://blog.atom.io/2014/03/03/styling-hyperlinks.html</guid>

[kevinsawicki]

/cc @cameronmcefee

[cameronmcefee]

Thanks for the report. The second half of that was deployed a few weeks ago based on another report. I made the change from the first line just now. Thanks @veganstraightedge