Adds support for Ubuntu 10.04 (Lucid)
Adding install of curl to postinstall script since this is required
to install the vagrant ssh keys later on.
Changing the way we're modifying sudoers.  Adding a %vagrant line
via /etc/sudoers.d is ignored due to the ordering of declarations
in sudoers:

> #includedir /etc/sudoers.d
>
> # Members of the admin group may gain root privileges
> %admin ALL=(ALL) ALL

(the %admin final declaration will override what's granted via
sudoers.d)
Adds a custom install set for Ruby 1.8.7, newer Rubygems and Chef.
Switches the Ubuntu preseed to use 'git-core' to support Lucid.
Switches the Lucid template to use the standard preseed.
Removes the Lucid specific preseed.
Updates the Wheezy ISO reference and checksum.
Removes the duplicated curl install from postinstall.sh.
Merges in @reubenavery's Lucid addition.
Adds the shell of lib/.
Adds a utility module for rendering ERB templates in their own context.

This serves two purposes, to extract the ERB usage and to keep what's passed
to the template clean. This should clarify what's being passed to be rendered
in future.
Extracts the box building functionality into Boxes::Builder.
Adds a default argument to builder for the output name.
Adds a script to setup chruby, ruby-install and rubies 1.9.3, 2.0.0 and 2.1.2.
Adds a 'special box' type that provides a ruby environment.
Reverts to the old method of configuring password-less sudo.

It's possible that this is now broken on lucid. But it was broken everywhere
else before.
bump debian version