fixing the nuget package for Appveyor

[gaelcolas]

Fixed (see https://ci.appveyor.com/project/gaelcolas/samplemodule/build/artifacts) The zipping was ok but the nupkg was done one folder above what it should have.

There was also an issue when specifying the psd1, trying to get the .parent of a string returned $null.

[RamblingCookieMonster]

soooo it looks like someone lazy merged in a WIP, sorry about that, and thanks for cleaning up the mess!!