vmw: Support VMware Worksation on Windows

Tested on VMWare Worksation on Windows/Linux and VMware Fusion on Mac

Note: VMware Player does not contain vmrun which required by capstan, so
we do not support VMware Player.

Fixes #53.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Merge pull request #54 from asias/vmw

vmw: Support VMware Worksation on Windows