Replace doctests with unittest

For now we test the same as the old doctests
Make disqus_dev tag set disqus_url to full URL for page.

Otherwise all comments made on the dev site are attached to the root of the
site, not to their respective pages.
Add disqus_sso tag

So users who are logged into the Django site can post comments to Disqus
without having to log in to disqus separately
change gitmodule URL to public URL
change gitmodule URL to public URL
Simplify templatetag registration, allow setting disqus_category_id.

Automatically merge multiple arguments passed to disqus_url templatetag, as
this allows you to write:

    {% set_disqus_identifier request.get_host "/" unique_object_id %}
    {% set_disqus_url "http://" request.get_host request.path %}

in your templates and have them concatenated to valid identifiers and URLs
automatically, without writing any code in your view.
Merge branch 'master' of git://github.com/aptivate/django-disqus
Merge branch 'master' of https://github.com/arthurk/django-disqus

Remove the protocol from the URL, to support https as well as http, while
keeping the fix that attaches comments to the correct page instead of the
site root URL.

Conflicts:
	disqus/templatetags/disqus_tags.py
Merge pull request #29 from aptivate/master

Make disqus_dev tag set disqus_url to full URL for page.