Fixed #453 -- 'django-admin install' now does model validation before installation. Lightly refactored django.core.management to add a get_validation_errors() function, which validate() wraps.
Fixed #453 -- 'django-admin install' now does model validation before installation. Lightly refactored django.core.management to add a get_validation_errors() function, which validate() wraps.

git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@609 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django