Fixes message display after action handling.

Calls unicode to force encoding of object name to a localized
unicode string. Also fixes deleted object count by saving
len(queryset) to a local var before calling queryset.delete(), as
the len after queryset.delete() is always zero.
Merge branch 'bugfix/delete-action-message-display' of git://github.com/chrislawlor/django-admin2 into chrislawlor-bugfix/delete-action-message-display
small correction on model naming