Merge pull request getpelican#574 from rn4ir/graymill-update

Graymill: Change 'pages' variable to lower-case

graymill/templates/base.html

@@ -61,7 +61,7 @@
                 <li><a href="{{ link }}">{{ title }}</a></li>
         {% endfor %}
 
-        {% if DISPLAY_PAGES_ON_MENU and PAGES %}
+        {% if DISPLAY_PAGES_ON_MENU and pages %}
             {% for p in pages %}
                 <li><a href="{{ SITEURL }}/{{ p.url }}">{{ p.title }}</a></li>
             {% endfor %}