[1.3.X] Fixed #16677 -- Fixed the future version of the ssi template tag to...

[1.3.X] Fixed #16677 -- Fixed the future version of the ssi template tag to work with template file names that contain spaces. Backport of r16687 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@17804 bcc190cf-cafb-0310-a4f2-bffc1f526a37