anchor.diff:  // [fsi:   ("Microsoft.AspNet.Razor", "2.0.30506.0"); ("NUnit", "2.6.3");]
   // [fsi:   ("RazorEngine", "3.3.0"); ("Zlib.Portable", "1.10.0")]]
   
  -
   // list only the direct dependencies
   Dependencies.GetDirectDependencies()
   // [fsi:val it : (string * string) list =]
  
positive.code: (**
  ## Adding and removing NuGet packages
  
  Paket allows to install and uninstall NuGet packages programmatically.
  *)
  
  // install a package
  
negative.code: (**
  ## Query the install model
  
  It's possible to do queries against the installed NuGet packages:
  *)
  
  // install some packages
  