Make deploy of ADDS on 2008 idempotent

Without this patch, deploying ADDS on Windows 2008 is not idempotent and
works the first time and fails on subsequent runs.
Correct style. No functional changes.
Merge pull request #3 from ghoneycutt/make_forest_idempotent

Make forest idempotent
Add metadata to Modulefile
Relax dependency on joshcooper/powershell

This patch would make it so that we do not depend on a specific version
of joshcooper/powershell, since it is still pre 1.0.0.
Relax dependency on stdlib to 3.2.0

We do not actually use any features that are only in 4.1.0 and since it
is equivalent to 3.2.0, we should use that to be more inclusive.
Update metadata
Merge pull request #5 from ghoneycutt/metadata

Metadata
Create LICENSE
Add license to metadata
ignore pkg/