Changed django-admin so that it doesn't load django.core.db or django.core.meta unless it needs to. As a result, 'django-admin startproject' works even if the database parameters are set incorrectly

git-svn-id: http://code.djangoproject.com/svn/django/trunk@101 bcc190cf-cafb-0310-a4f2-bffc1f526a37