Update stylesheet and templates

Stylesheets update includes:
- Changing pygments class to default .codehilite
- Introduction of styles for new template components
- changing to a 16 column layout ( might revert back to 12 )
- reducing column gutter
Template work includes:
- removing extra ul from site_social
- adding creative commons handling to page_footer
- creating tags to display all tags with article counts
- adding the blogroll to base in aside
- starting work on tag

templates/_site_social.html

@@ -1,5 +1,3 @@
-<ul class="social-area">
-  {% for network, url in SOCIAL %}
-    <li><a href="{{ url }}"><i class="huge icon-{{ network }}"></i></a></li>
-  {% endfor %}
-</ul>
+{% for network, url in SOCIAL %}
+<li><a href="{{ url }}" title="{{ network|title }}"><i class="huge icon-{{ network }}"></i></a></li>
+{% endfor %}