Enable template fragment caching on package details page

We can't cache most of the package actions links stuff because we look at
the user there, but we can cache everything on the left and the content of
the bottom boxes.

Signed-off-by: Dan McGee <dan@archlinux.org>

templates/packages/details.html

@@ -1,4 +1,6 @@
 {% extends "base.html" %}
+{% load cache %}
+
 {% block title %}Arch Linux - {{ pkg.pkgname }} {{ pkg.pkgver }}-{{ pkg.pkgrel }} - Package Details{% endblock %}
 {% block navbarclass %}anb-packages{% endblock %}
 
@@ -63,6 +65,7 @@ <h4>Versions Elsewhere</h4>
 
     </div><!-- #actionlist -->
 
+    {% cache 300 package-details-pkginfo pkg.id %}
     <table id="pkginfo">
         <tr>
             <th>Architecture:</th>
@@ -204,6 +207,8 @@ <h3 title="Complete list of files contained within this package">
         </div><!-- #pkgfiles -->
 
     </div><!-- #metadata -->
+    {% endcache %}
+
 </div><!-- #pkgdetails -->
 
 {% load cdn %}{% jquery %}