Fixed #7478 -- Rolled QuerySetPaginator into the Paginator class, to simplify...

Fixed #7478 -- Rolled QuerySetPaginator into the Paginator class, to simplify things. QuerySetPaginator still exists as an alias, for backwards compatibility. Thanks for the suggestion, batiste@dosimple.ch

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7865 bcc190cf-cafb-0310-a4f2-bffc1f526a37