Slim down box builds by removing unnecessary firmware and docs.
Also make sure kludgezu isn't installed on any boxes. This causes the host-only networking problems indicated in BENTO-52.
Put vagrant sudo configuration in a separate file

Put vagrant sudo configuration in /etc/sudoers.d/vagrant rather than
/etc/sudoers, so that if, say, Chef writes out a new /etc/sudoers, sudo
from vagrant continues to work.
Add templates for Mac OS X 10.7, 10.8, 10.9.