Initial working test.

Hey Nick,
This is super rough right now-I need to refactor and clean up (and I'll take a look at the versioning stuff that you mentioned).

But it works!

I just took the code from PkgCreator and used the info we already know prior to creating a packaging request to do another StopProcessingIf.

Also, it retains the setting of "pkg_path" that PkgCreator does so further steps can work (JSSImporter, for example).

I haven't touched the munki recipe yet. Just a proof of concept at this point. Probably not really a pull request yet...