Fixed #12613 -- Added Q and Z to the list of characters supported by the...

Fixed #12613 -- Added Q and Z to the list of characters supported by the phone2numeric filter. Thanks to gabrielhurley for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12425 bcc190cf-cafb-0310-a4f2-bffc1f526a37