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.

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@15258 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django-nonrel/django-nonrel,skevy/django,Instagram/django,disqus/django-old,django-nonrel/django-nonrel,jamespacileo/django-france,jamespacileo/django-france,django-nonrel/django-nonrel,mitsuhiko/django,disqus/django-old,jamespacileo/django-france,Instagram/django,mitsuhiko/django,disqus/django-old,skevy/django,mitsuhiko/django,skevy/django,Instagram/django