Simplify setup.py
Add travis.yml
Generalize gitignore globs
django.contrib.gis.utils deprecated

In https://docs.djangoproject.com/en/dev/internals/deprecation/ it is stated that:

The GeoIP class was moved to django.contrib.gis.geoip in 1.4 – the shortcut in django.contrib.gis.utils will be removed.

Changed models.py to work with django 1.6.
Added start_date and end_date to context.
Changed manager to reflect possibility of use WITHOUT registered users.
Ensure Visitor.user is set on creation

Fix #15