Support running Puppet masters from raw gems rather than apt packages.

Ok guys, this is a total work in progress... I'll likely make 30 more commits before its ready, so don't treat this as a merge-able PR. Instead, I'm looking for your feedback on my re-structuring of the classes into parameterized classes. I strongly suggest this model because its far more easily unit testable (see how much simpler the unit tests get). Additionally, it makes things a bit more explicit (rather than doing class-to-class private variable sharing, which is pretty dangerous).
We use this in our code so that we can do smaller rake tests when developing code:

```
rake spec[spec/classes/my_spec_file.rb]
```

That said, for some reason its not working in this environment, so I'll pull it out right now