1. Made default layout more generic.

2. Added a page layout and improved html on post layout.
3. Improved flexibility of stylesheets for different layout types.
4. Collapsing sidebar now moves it to the bottom of the page and floats
content into columns.
5. Improved sharing settings, added Google plus one.

.themes/classic/source/index.html

@@ -2,6 +2,7 @@
 layout: default
 blog_index: true
 ---
+<div class="blog-index">
 {% assign index = true %}
 {% for post in paginator.posts %}
 {% assign content = post.content %}
@@ -13,7 +14,7 @@ blog_index: true
   {% if paginator.next_page %}
     <a href="/page{{paginator.next_page}}/">&larr; Older</a>
   {% endif %}
-  <a href="/blog/archives.html">Blog Archive</a>
+  <a href="/blog/archive.html">Blog Archive</a>
   {% if paginator.previous_page %}
     <a href="/page{{paginator.previous_page}}/">Newer &rarr;</a>
   {% endif %}
@@ -29,3 +30,4 @@ blog_index: true
     }());
 </script>
 {% endif %}
+</div>