Adding build tools for CI builds.  This can be coupled with a CI system to manage the builds like this:
NuGet install Naos.Powershell.Build -OutputDirectory ./NaosBuildTools
$buildScript = Join-Path (Join-Path (ls ./NaosBuildTools/Naos.Powershell.Build.*).FullName 'scripts') 'Build.ps1'
&$buildScript -Version $env:appveyor_build_version -SourceDirectory . -GalleryUrl $env:appveyor_account_nuget_url -GalleryApiKey $env:appveyor_account_nuget_key -Run