Refactored SiteMap to be generic
With this mechanism (in combination with the new sidebar) in place
adding a new entity to the site becomes very easy, rather than having
to add a lot of code to 'map.py', one can simply register with
the sitemap modules.
"Decorator for views that gzips pages if the client supports it."
from django.utils.decorators import decorator_from_middleware
from django.middleware.gzip import GZipMiddleware
gzip_page = decorator_from_middleware(GZipMiddleware)