Initial release version of templates

The templates in this commit are now in RC form.
Everything but the article templates are ready.

Changes include ( no limited to ):
- Update stylesheet
- Add method in app.js to handle images in documents
- Create _author_item.html to display author information and vcard
- Update _disqus.html to fit in with site style
- Update _page_footer.html for translation support
- Add _pagination.html for pagination support
- Add _translations.html for translation listing support
- Minor updates to archives.html, tags.html
- Update base.html to have more flexibility
- Update authors.html and author.html to display information
- Update category.html and categories.html to use the _list_item.html
- Update page translation support + misc
- Update tag.html to use _list_item.html

templates/_translations.html

@@ -0,0 +1,10 @@
+{% macro translations_for(article) %}
+{% if article.translations %}
+<li>Translations: 
+{% for translation in article.translations %}
+<a href="{{ SITEURL }}/{{ translation.url }}">{{ translation.lang }}</a>
+{% if not loop.last %},{% endif %}
+{% endfor %}
+</li>
+{% endif %}
+{% endmacro %}