(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
(maint) Disable missing-field-initializers-warning
(maint) update fedora20 preq. package list
Merge pull request #144 from jhoblitt/feature/readme_fedora20

(maint) update fedora20 preq. package list
Merge pull request #145 from MikaelSmith/maint/master/disable-initializers-warning

(maint) Disable missing-field-initializers-warning
Merge pull request #135 from vrthra/fix/cfact-129/zfs-solaris

(CFACT-120) Add zpool facts for solaris
(CFACT-120) Add zfs facts for solaris
(CFACT-91) Add Windows external fact infrastructure.

Add some external fact support, with framework for executables.
New to Windows are batch files and Powershell scripts.
Partial implementation of process execution
Add link for redirecting input/output with CreateProcess