Add support for VMware Fusion

This is my first git and Github commit pretty much _ever_, so apologies if I've done something wrong. Just adds a cask for VMware Fusion. Because you have to login to download the binary directly from VMware, the link uses Boxen's link for VMware Fusion (https://github.com/boxen/puppet-vmware_fusion) but uses a sha1sum obtained from VMware to ensure the binary is genuine.