Removed unavailable boxes

Ubuntu Oneiric 64, cause GitHub does not allow download of big blobs.

Not Found boxes (HTTP/1.1 404 Not Found):

* Archlinux 2011.08.19 - 64: this box redirects to
* http://sourceforge.net;
* Debian Lenny 32 puppet;
* Debian Lenny 32;
* Debian Wheezy amd64 minimal (base install  ... just an install');
* Fedora 18 x86_64 Minimal (with Puppet, VirtualBox 4.2.6 and
* rpmfusion);
* OpenBSD 5.0 (i386);
* OpenSUSE 12.1 64 puppet (until 2012-12-17): the message "The
  application/octet-stream file vagrant-opensuse-121-64.box (524 379 648
  bytes) uploaded onto the Inria exchange server by
  Remy.Garrigue@inria.fr on 17-07-2012 at 17:34 for five months has
  reached its time limit, and has been removed)" is displayed instead
  the box content.
Created an script to check boxes

The script check the HTTP status code of the boxes from an file.