moved is_user_hive_member from views.py to models.py.
added 'slug' field to organization.
membership directory excludes inactive users
added is_active field to organization.
added 'manage.py seeddata' command.
added --password option to seeddata command.
seeddata sets site name to 'Hive TESTING'.
added an /admin/switch-user/ endpoint accessible by superusers only.