V2 initial WiP
v2 additional WiP updates
Adds VirtIO drivers support
Fixes VHD path issue
Enables PowerShell on 2008 R2 Server Core
Minor refactoring

Adds also a missing Close() call on the Unattend.xml
output stream.
Adds explicit dism module import
Merge pull request #21 from alexpilotti/master

V2