NHV-125: Release validator for NH 4.0
Updated projects to .NET 4.0 and NHibernate 4.0.1
Projects are signed using reference to shared license file
Using NuGet packages whenever possible (except SharpTextEx)
Removed non-generic-collection-related members from unit tests
Updated release notes
Updated build scripts for .NET 4.0 and appropriate locations of assemblies
Commented out sign attribute in common assembly info