Add list_helpers functions that are going to be used when rendering list views like (Users List, Sponsors List etc). Add list default templates and CSS classes. Patch by: Pawel Solyga Reviewed by: to-be-reviewed

class_prepared = object()

pre_init= object()
post_init = object()

pre_save = object()
post_save = object()

pre_delete = object()
post_delete = object()

post_syncdb = object()