Added support for pypins using a pypin class:

For example:

.. image:: https://pypip.in/status/frog-croak/badge.png
   :class: pypin
Added missing "View on github" and footer atom and RSS feeds features.
Fixing error in article template.
Added tags to the top of the article title.
Backported important changes from Kura's Gastly into Hauntr.
Fixed small issue with pypins.
Added new presentations link.