vm-bhyve-0.8.7

Tag a proper release with the uefi code.

Notable changes:

Support for zvols (diskX_dev="zvol" or diskX_dev="sparse-zvol")
UEFI support for Windows guests including sample template
Guest locking for shared storage environments
New configuration options - comports, uuid, networkX_mac
Version test to make sure system is running a supported FreeBSD version