Ensure Vagrant version is at least 1.8.0
Use the Vagrant.require_version helper documented here: https://www.vagrantup.com/docs/vagrantfile/vagrant_version.html Eliminates issues like #238.
Ensure Vagrant version is at least 1.8.0
Use the Vagrant.require_version helper documented here: https://www.vagrantup.com/docs/vagrantfile/vagrant_version.html Eliminates issues like #238.
