(CFACT-51) Update Windows build instructions

Correct a few old comments.
Add pointer to gist of Powershell script to bootstrap a system.
Merge pull request #143 from MikaelSmith/task/master/CFACT-51-update-Windows-instructions

(CFACT-51) Update Windows build instructions
(CFACT-120) Add zpool facts for solaris

This patch adds support for zpool facts for solaris. It includes current
version, supported features, and zpools available, their size and available
space.
(CFACT-120) Add zfs facts for solaris

This patch adds suppport for zfs facts for solaris. It lists the version,
supported features, and currently known properties of all zfs datasets