Allow building of i386 FreeBSD box provisionerless or with Chef.
Use correct sudoers changes for Ubuntu 12+.

In the veewee definitions, Ubuntu 10 and 11 use the common ubuntu
configuration which exempts the admin group. The Ubuntu 12 and 13
definitions don't use the common configuration, instead they use the sudo
group.

Set exempt sudo user based on lsb_release and handle sudoers NOPASSWD
config change correctly.
For all Ubuntu boxes, use @jon918's unified sudoers script from [GH98] rather than random variants.
Merge branch 'jcd/use-jon918-sudoers'
Added Fedora 20 Beta support.