Winrm msgs

This PR adds extra info and warning messages for winrm and ssh communicators.

Also updated the Vagrantfile for testing the provisioning of a Windows machine. In order to test it:
- You'll need a fix or workaround the bug introduced in #101, which breaks image names with spaces.
- It will hang after displaying "Waiting for winrm to become available at #{ip}..", since the base images don't have winrm enabled and there isn't support for uploading a bootstrap.cmd script yet. Once you see the IP you can manually log in via Remote Desktop and execute [a script to setup winrm](https://github.com/maxlinc/vagrant-rackspace/blob/windows/setup.ps1) so will continue.