@derekerdmann's changes plus UNC fixes and tests

Based off of [Pull Request 9](https://github.com/chrisbenti/PS-Config/pull/9), adds in a fix for UNC share drive support.

Also adds in testing framework. Note, this is a Powershell module that is a git submodule in the repo, so you will have to ```git submodule init``` and ```git submodule update``` in (PSConfigRoot)\Modules\Pester.