Add multiple provider support to Vagrant driver
Add VMware support to VagrantfileCreator

Add support for VMware in the VagrantfileCreator class by breaking out
the customization logic into separate methods for Virtualbox/VMware.
Update documentation for VMware
Merge branch 'add-vmware-support' of https://github.com/intoximeters/kitchen-vagrant into intoximeters-add-vmware-support

Conflicts:
	lib/kitchen/vagrant/vagrantfile_creator.rb
Fix up README lines.