Added references to the documentation
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<pre>svn co https://svn.sourceforge.net/svnroot/httplib2/trunk httplib2</pre>
+<h3>Documentation</h3>
+
+<p>In addition to the <a href="ref/">Python library style documentation</a> there
+are also two articles on XML.com, <a href="http://www.xml.com/pub/a/2006/02/01/doing-http-caching-right-introducing-httplib2.html">
+ Doing HTTP Caching Right: Introducing httplib2</a> and
+<a href="http://www.xml.com/pub/a/2006/03/29/httplib2-http-persistence-and-authentication.html">
+httplib2: HTTP Persistence and Authentication </a>.
+
+</p>
<h3>Feedback</h3>