Allow for extra dynamic fields for the create form Also some minor cleanups, such as making base.Logic inherit from object, as per the style guide. Patch by: Sverre Rabbelier

# Geo-enabled Sitemap classes.
from django.contrib.gis.sitemaps.georss import GeoRSSSitemap
from django.contrib.gis.sitemaps.kml import KMLSitemap, KMZSitemap