Fixed #15281 -- Made the static view use an iterator when serving a file, effectively making this less of a memory hog. Also use the appropriate attributes of the stat object instead of indexes. Thanks for the initial patch, FunkyBob and aaugustin.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15701 bcc190cf-cafb-0310-a4f2-bffc1f526a37