#162: add link to sphinx.pocoo.org/latest.

doc/_templates/indexsidebar.html

@@ -11,6 +11,8 @@
 <p>Get Sphinx from the <a href="http://pypi.python.org/pypi/Sphinx">Python Package
 Index</a>, or install it with:</p>
 <pre>easy_install -U Sphinx</pre>
+<p>Latest <a href="http://sphinx.pocoo.org/latest/">development version docs</a>
+are also available.</p>
 {% endif %}
 
 <h3>Questions? Suggestions?</h3>