anchor.diff:  type NugetFrameworkReferences = 
       { FrameworkVersion : string
         References : NugetReferences }
  +
  +type NugetSymbolPackage =
  +    /// Do not build symbol packages
  +    | None = 0
  +    /// Build a symbol package using a project file, if provided
  +    | ProjectFile = 1
  +    /// Build a symbol package using the nuspec file
  +    | Nuspec = 2
   
   /// Nuget parameter type
   type NuGetParams = 
  
positive.code:     let parameters = NuGetDefaults() |> setParams
      try 
          let nuspecFile = createNuspecFile parameters nuspecFile
          packSymbols parameters
          pack parameters nuspecFile
          if parameters.Publish then 
              publish parameters
  
negative.code:       ReferencesByFramework : NugetFrameworkReferences list
        PublishTrials : int
        Publish : bool
        SymbolPackage : NugetSymbolPackage
        Properties : list<string * string>
        Files : list<string*string option*string option>}
  
  