Started work on new theme.

Starting from the 'simple' theme that comes with pelican. No CSS yet.
Front page with list of post summaries

Configure number of posts using ARTICLES_FRONT_PAGE
Customized archives to list articles with ul
Cleaned up article template
Extra comma between Pelican and Python
Edited pages so that they are on the root path
Rudimentary css
Finished new theme

Responsive CSS, tweaks to page templates, removed old themes.
Merge pull request #1 from leouieda/new-theme

New theme for the site