Added Debian Squeeze 64 with Puppet 2.7

Added a Debian Squeeze 64 Image which I've prepared from a Minimal Netboot distribution image, and then added puppetlabs apt repository and puppet pinned at version 2.7.*

Useful for puppet 2.7's increased warnings about forward compatibility issues for migrating puppet configurations to puppet 3.x.x.
remove entry for incomplete centos 6 base box

This CentOS 6 box does not have puppet installed, and as such doesn't meet the requirements to be considered a Vagrant base box according to these guidelines: http://vagrantup.com/v1/docs/base_boxes.html

I propose that the url be removed from the page, especially since there are multiple other CentOS 6 images that work great.
Added Ubuntu 12.10 Quantal 64 box with guest additions 4.2.2
Merge pull request #54 from roderik/quantal64

Added Ubuntu 12.10 Quantal 64 box with guest additions 4.2.2
Merge pull request #52 from justinclayton/patch-1

remove entry for incomplete centos 6 base box
Merge pull request #51 from mc0e/patch-1

Added Debian Squeeze 64 with Puppet 2.7
Merge pull request #50 from willian/master

Added a new box for Debian Squeeze 64bit
Added FreeBSD 9.1 amd64 - ZFS on root
Removed entry with dead link
Updated last modification date.
Added ability to sort table (faster than CTRL+F)
add a minimal basebox for Debian Wheezy, with nothing additional installed, just installed
Merge pull request #57 from leapcode/master

Adding a minimal Debian Wheezy basebox
Merge pull request #55 from xironix/master

Added FreeBSD 9.1 + other features
Added FreeBSD 9.1-RC2 amd64 UFS system
Also corrected download links.
Corrected sizes as I optimized the vbox files.
added ubuntu server 12.04.1 i686
Merge pull request #59 from xironix/master

Added FreeBSD 9.1 amd64 UFS System + corrected download links
Merge pull request #63 from bubenkoff/master

added ubuntu server 12.04.1 i686
remove broken link as per issue #46