Improved support for adding author metadata to pages

.themes/classic/source/_includes/post/author.html

@@ -1,5 +1,7 @@
 {% if post.author %}
   {% assign author = post.author %}
+{% elsif page.author %}
+  {% assign author = page.author %}
 {% else %}
   {% assign author = site.author %}
 {% endif %}

.themes/classic/source/_layouts/page.html

@@ -11,7 +11,11 @@ layout: default
   {{ content }}
   {% unless page.footer == false %}
     <footer>
-      {% if page.date %}<p class="meta">{% include post/date.html %}</p>{% endif %}
+      {% if page.date or page.author %}<p class="meta">
+        {% if page.author %}{% include post/author.html %}{% endif %}
+        {% include post/date.html %}
+        {% if page.categories %}{% include post/categories.html %}{% endif %}
+      </p>{% endif %}
       {% unless page.sharing == false %}
         {% include post/sharing.html %}
       {% endunless %}