Improved sending of notices.
Improved sending of notices.

    * notifications.create has been renamed to notifications.send.
    * send now takes a list of users instead of a single user.
    * send now can take an optional issue_notice when a Notice should not be
      created for the notification.
    * send no longer returns a value.
    * should_send takes a user and notice_type as opposed to a single Notice
      instance.


git-svn-id: 6013846dc53b2e0dba4a31a2739da660c67de77d@29 590c3fc9-4838-0410-bb95-17a0c9b37ca9

daniell/django-notification,daniell/django-notification,lehins/lehins-notification,brosner/django-notification,theatlantic/django-notification,ntucker/django-notification,lehins/lehins-notification,arctelix/django-notification-automated,dhan88/django-notification,pragmaticbadger/django-notification,theatlantic/django-notification,aptivate/django-notification,JordanReiter/django-notification,jkal/django-notification,ntucker/django-notification,festicket/django-notification