Solved the JSON caching problem for bulk acceptance.
This is done in the same way as it is done in AJAX calls by appending the current time as a GET argument.
Patch by: Mario Ferraro, Lennard de Rijk
Reviewed by: Lennard de Rijk
# Geo-enabled Sitemap classes.
from django.contrib.gis.sitemaps.georss import GeoRSSSitemap
from django.contrib.gis.sitemaps.kml import KMLSitemap, KMZSitemap