Changes about locales and dates.

Add a way to specify the locale in the settings, and the date formating as well.
Fixes #61.

pelican/themes/martyalchin/templates/category.html

@@ -4,6 +4,6 @@
 <div class="info"></div>
 {% for article in articles %}        
 <h2><a href="{{ SITEURL }}/{{ article.url }}">{{ article.title }}</a></h2> 
-<p class="published">{{ article.date.strftime('%a %d %B %Y') }}</p>
+<p class="published">{{ article.locale_date }}</p>
 {{ article.summary }}
 {% endfor %}