Added vagrant-aspen playbook and vagrant conf

@jarv, can you review this? I'm in the process of testing, to be sure that this works the way I expect. (I mostly copied the vagrant file from `vagrant-fullstack.yml`.)
Sorry... one more question about this.  Does `configuration_version` in this line also need to be updated to use the release name (defaulting to 'release' or 'master' depending on how we want to handle it)?