Adds 3 new variables: - `VAGRANT_CPUS`: Defaults to '' which will use Vagrant's default when setting the cpu. It's 1 i believe. Can be used to set the amount of CPUs. It sets `vb.cpus` in the `Vagrantfile` - `VAGRANT_MEMORY`: Defaults to '' which will use Vagrant's default when setting memory. Can be used to set the amount of Memory on MB. It sets `vb.memory` in the `Vagrantfile` - `VAGRANT_RUN_PUPPET`: Defaults to '1' which will cause the provision section in the `Vagrantfile` and `builds/Vagtanfile` to run `puppet agent -t` if puppet is installed on the VM.