Add basic Sponsors List, Create New Sponsor, Sponsor Public Profile views. Change all properties in Group model as required for now. Remaining TODO: write validation functions for Sponsor edit and create form fields that need additional validation (like address, phone number format). Patch by: Pawel Solyga Review by: to-be-reviewed

"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)