Added contrib apps to ignore list when running makemessages in the Djagno source tree and added a --no-obsolete option in preparation of moving app translations out of core.
Added contrib apps to ignore list when running makemessages in the Djagno source tree and added a --no-obsolete option in preparation of moving app translations out of core.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%4015258

adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel