Add the ability to version autoscale groups

If you have the following autoscale group:

    app_www-12_04

And the following dna file:

    dna/asg/app_www-12_04

And you wish to roll over to a new autoscale group named:

    app_www-12_04-v001

Then rather than make you create new dna files/whatever, you can simply run chef-solo-cup against the new autoscale group and it will automatically pick up the existing dna file.

This also makes it simple to do something like:

    # new asg node on a new version of the os
    app_www-12_04 => app_www-14_04

and use the following dna file:

    dna/asg/app_www

Notes:

- Logic goes: Match if exact, else match by substring, else just use the autoscale group name.
- this is a very naive string match, so if multiple things match, you'll be SOL. Don't do that
Release version 0.0.16