Fixed #18071 -- Ignored case sensitivity in urlize utility. Thanks...

Fixed #18071 -- Ignored case sensitivity in urlize utility. Thanks luke@creaturecreative.com and adamzap for the report and the patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@17898 bcc190cf-cafb-0310-a4f2-bffc1f526a37