(windows) Allow Puppet version to be specified
(windows) Allow Puppet version to be specified

This allows you to specify the version you want and the url is updated
accordingly. Also updated the MSI to the latest stable release.

zpetr/puppet-bootstrap,braf/puppet-bootstrap,SugarFactory/puppet-bootstrap,MiamiOH/puppet-bootstrap,rbramwell/puppet-bootstrap,cregev/puppet-bootstrap,chadq/puppet-bootstrap,mmcquillan/puppet-bootstrap,hashicorp/puppet-bootstrap,czhujer/puppet-bootstrap,jeckhart/puppet-bootstrap,virajs/puppet-bootstrap