[1.0.X] Fixed #10513: floatformat now works with floatish things, not just...

[1.0.X] Fixed #10513: floatformat now works with floatish things, not just real floats. Thanks, Alex. Backport of [10278] from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10299 bcc190cf-cafb-0310-a4f2-bffc1f526a37