Update templates

The following updates are made:
- index.html now lists the site description along with X articles
- _list_item.html universalizes code for iterating over the articles
- _site_social.html is merged into base.html
- _google_search.html is added for custom search support
- _gosquared.html, _google_analytics.html have minor formatting changes
- archives.html displays a one page list of all articles
- period_archives.html is removed as it is not planned for implementation atm
- tags.html general clean up and tweaks
- base.html now has
  - full rss/atom feed support
  - disqus comment count support on links (not used yet)
  - blog links in aside
  - search in aside

templates/index.html

@@ -1,5 +1,24 @@
 {% extends 'base.html' %}
-{% block content %}
-
-
+{% block content_title %}
+<a href="{{ SITEURL }}/index.html" rel="bookmark">{{ SITENAME }}</a>
+{% endblock %}
+{% block content %}
+<p>{{ SITE_DESCR }}</p>
+{% if articles and ARTICLES_ON_INDEX %}
+<h2>Recent Articles:</h2>
+<ul class="article-list">
+{% for article in articles[0:ARTICLES_ON_INDEX] %}
+{% include '_list_item.html' %}
+{% endfor %}
+</ul>
+<p><a href="{{ SITEURL }}/archives.html">View more articles in the Archives...</a></p>
+{% endif %}
+{% if pages and PAGES_ON_INDEX %}
+<h2>Pages:</h2>
+<ul class="inline-list">
+{% for page in pages %}
+  <li><a href="{{ SITEURL }}/{{ page.url }}">{{ page.title }}</a></li>
+{% endfor %}
+</ul>
+{% endif %}
 {% endblock %}