Update tests output with feedgenerator 1.6

feedgenerator 1.6 includes a change to write feed attributes in a consistent
order between py2.7 and py3.3.

pelican/tests/output/custom/feeds/all.rss.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/all.rss.xml" rel="self"></atom:link><lastBuildDate>Fri, 30 Nov 2012 00:00:00 +0100</lastBuildDate><item><title>FILENAME_METADATA example</title><link>http://blog.notmyidea.org/filename_metadata-example.html</link><description>&lt;p&gt;Some cool stuff!&lt;/p&gt;
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/all.rss.xml" rel="self"></atom:link><lastBuildDate>Fri, 30 Nov 2012 00:00:00 +0100</lastBuildDate><item><title>FILENAME_METADATA example</title><link>http://blog.notmyidea.org/filename_metadata-example.html</link><description>&lt;p&gt;Some cool stuff!&lt;/p&gt;
 </description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexis Métaireau</dc:creator><pubDate>Fri, 30 Nov 2012 00:00:00 +0100</pubDate><guid>tag:blog.notmyidea.org,2012-11-30:filename_metadata-example.html</guid></item><item><title>Trop bien !</title><link>http://blog.notmyidea.org/oh-yeah-fr.html</link><description>&lt;p&gt;Et voila du contenu en français&lt;/p&gt;
 </description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexis Métaireau</dc:creator><pubDate>Fri, 02 Mar 2012 14:01:01 +0100</pubDate><guid>tag:blog.notmyidea.org,2012-03-02:oh-yeah-fr.html</guid></item><item><title>Second article</title><link>http://blog.notmyidea.org/second-article.html</link><description>&lt;p&gt;This is some article, in english&lt;/p&gt;
 </description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexis Métaireau</dc:creator><pubDate>Wed, 29 Feb 2012 00:00:00 +0100</pubDate><guid>tag:blog.notmyidea.org,2012-02-29:second-article.html</guid><category>foo</category><category>bar</category><category>baz</category></item><item><title>Deuxième article</title><link>http://blog.notmyidea.org/second-article-fr.html</link><description>&lt;p&gt;Ceci est un article, en français.&lt;/p&gt;

pelican/tests/output/custom/feeds/bar.rss.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/bar.rss.xml" rel="self"></atom:link><lastBuildDate>Wed, 20 Oct 2010 10:14:00 +0200</lastBuildDate><item><title>Oh yeah !</title><link>http://blog.notmyidea.org/oh-yeah.html</link><description>&lt;div class="section" id="why-not"&gt;
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/bar.rss.xml" rel="self"></atom:link><lastBuildDate>Wed, 20 Oct 2010 10:14:00 +0200</lastBuildDate><item><title>Oh yeah !</title><link>http://blog.notmyidea.org/oh-yeah.html</link><description>&lt;div class="section" id="why-not"&gt;
 &lt;h2&gt;Why not ?&lt;/h2&gt;
 &lt;p&gt;After all, why not ? It's pretty simple to do it, and it will allow me to write my blogposts in rst !
 YEAH !&lt;/p&gt;

pelican/tests/output/custom/feeds/cat1.rss.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/cat1.rss.xml" rel="self"></atom:link><lastBuildDate>Wed, 20 Apr 2011 00:00:00 +0200</lastBuildDate><item><title>A markdown powered article</title><link>http://blog.notmyidea.org/a-markdown-powered-article.html</link><description>&lt;p&gt;You're mutually oblivious.&lt;/p&gt;
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/cat1.rss.xml" rel="self"></atom:link><lastBuildDate>Wed, 20 Apr 2011 00:00:00 +0200</lastBuildDate><item><title>A markdown powered article</title><link>http://blog.notmyidea.org/a-markdown-powered-article.html</link><description>&lt;p&gt;You're mutually oblivious.&lt;/p&gt;
 &lt;p&gt;&lt;a href="http://blog.notmyidea.org/unbelievable.html"&gt;a root-relative link to unbelievable&lt;/a&gt;
 &lt;a href="http://blog.notmyidea.org/unbelievable.html"&gt;a file-relative link to unbelievable&lt;/a&gt;&lt;/p&gt;</description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexis Métaireau</dc:creator><pubDate>Wed, 20 Apr 2011 00:00:00 +0200</pubDate><guid>tag:blog.notmyidea.org,2011-04-20:a-markdown-powered-article.html</guid></item><item><title>Article 1</title><link>http://blog.notmyidea.org/article-1.html</link><description>&lt;p&gt;Article 1&lt;/p&gt;
 </description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexis Métaireau</dc:creator><pubDate>Thu, 17 Feb 2011 00:00:00 +0100</pubDate><guid>tag:blog.notmyidea.org,2011-02-17:article-1.html</guid></item><item><title>Article 2</title><link>http://blog.notmyidea.org/article-2.html</link><description>&lt;p&gt;Article 2&lt;/p&gt;

pelican/tests/output/custom/feeds/misc.rss.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/misc.rss.xml" rel="self"></atom:link><lastBuildDate>Fri, 30 Nov 2012 00:00:00 +0100</lastBuildDate><item><title>FILENAME_METADATA example</title><link>http://blog.notmyidea.org/filename_metadata-example.html</link><description>&lt;p&gt;Some cool stuff!&lt;/p&gt;
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/misc.rss.xml" rel="self"></atom:link><lastBuildDate>Fri, 30 Nov 2012 00:00:00 +0100</lastBuildDate><item><title>FILENAME_METADATA example</title><link>http://blog.notmyidea.org/filename_metadata-example.html</link><description>&lt;p&gt;Some cool stuff!&lt;/p&gt;
 </description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexis Métaireau</dc:creator><pubDate>Fri, 30 Nov 2012 00:00:00 +0100</pubDate><guid>tag:blog.notmyidea.org,2012-11-30:filename_metadata-example.html</guid></item><item><title>Second article</title><link>http://blog.notmyidea.org/second-article.html</link><description>&lt;p&gt;This is some article, in english&lt;/p&gt;
 </description><dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexis Métaireau</dc:creator><pubDate>Wed, 29 Feb 2012 00:00:00 +0100</pubDate><guid>tag:blog.notmyidea.org,2012-02-29:second-article.html</guid><category>foo</category><category>bar</category><category>baz</category></item><item><title>Unbelievable !</title><link>http://blog.notmyidea.org/unbelievable.html</link><description>&lt;p&gt;Or completely awesome. Depends the needs.&lt;/p&gt;
 &lt;p&gt;&lt;a class="reference external" href="http://blog.notmyidea.org/a-markdown-powered-article.html"&gt;a root-relative link to markdown-article&lt;/a&gt;

pelican/tests/output/custom/feeds/yeah.rss.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/yeah.rss.xml" rel="self"></atom:link><lastBuildDate>Thu, 02 Dec 2010 10:14:00 +0100</lastBuildDate><item><title>This is a super article !</title><link>http://blog.notmyidea.org/this-is-a-super-article.html</link><description>&lt;p&gt;Some content here !&lt;/p&gt;
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Alexis' log</title><link>http://blog.notmyidea.org/</link><description></description><atom:link href="http://blog.notmyidea.org/feeds/yeah.rss.xml" rel="self"></atom:link><lastBuildDate>Thu, 02 Dec 2010 10:14:00 +0100</lastBuildDate><item><title>This is a super article !</title><link>http://blog.notmyidea.org/this-is-a-super-article.html</link><description>&lt;p&gt;Some content here !&lt;/p&gt;
 &lt;div class="section" id="this-is-a-simple-title"&gt;
 &lt;h2&gt;This is a simple title&lt;/h2&gt;
 &lt;p&gt;And here comes the cool &lt;a class="reference external" href="http://books.couchdb.org/relax/design-documents/views"&gt;stuff&lt;/a&gt;.&lt;/p&gt;