HTTP authentication support added.

RequestHandler class now can receive a tuple with user and password. For now,
just the get method was refactored, if necessary, post will too.
Django app files.

The same code should be a Python module, Django app and a XBMC addon.
These files are required to any Django app.

* models.py define classes to be stored in the databse;
* serializers.py define classes to be exported to RESTful API;
* views.py define objects to be showed in the web interface.