Remove the functions which generated Nuget packages for Windows.
Add function New-UnifiedNugetPackage to generate nuget packages for each assembly with unix and windows runtimes.
Add function New-NuSpec and New-ReferenceAssembly for creating the required items forNew-UnifiedNugetPackage.
Add a sample for cross platform project with conditional compilation for Linux.
Add function Publish-NugetToMyGet to publish nuget packages to powershell.myget.or
