added multi sidebar support

.themes/classic/source/index.html

@@ -1,6 +1,5 @@
 ---
 layout: default
-meta: false
 footer: false
 ---
 <div class="blog-index">
@@ -36,3 +35,10 @@ footer: false
 </script>
 {% endif %}
 </div>
+<aside role=sidebar>
+  {% if site.blog_index_asides.size %}
+    {% include_array blog_index_asides %}
+  {% else %}
+    {% include_array default_asides %}
+  {% endif %}
+</aside>