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).
it should be safe to include the apt class here if we're including manifests::repo::apt. If apt is being instantiated elsewhere, it's up to a custom profile class to provide the necessary ordering to insure that the custom instantiation of the apt class is evaluated before this re-invocation.. Or am I missing something?