VMWare Fusion boxes

**For discussion/yak shaving**

Add commands to generate VMWare Fusion boxes.

Things that are missing:

* This needs a lot of refactoring to DRY the scripts - it's largely a copy of the VirtualBox commands
* Installing the HGFS module doesn't really work - the packages mentioned in [Ubuntu's guide to VMWare Tools](https://help.ubuntu.com/community/VMware/Tools) don't actually do what they say they do, so anyone using this script needs to [manually install the VMWare Tools kernel extensions via the VMWare GUI](https://help.ubuntu.com/community/VMware/Tools#Installing_from_your_VMware_host), which sucks

Any ideas?