Provides an Autofac enabled bootstrapper for Caliburn.Micro.
* Upgraded to Autofac 188.8.131.522
* Upgraded to Caliburn.Micro 1.4
* Upgraded solution / project files to VS2012
* Minimum WPF support is now .NET 4
* Added support for Silverlight 5
* Changed NuGet packaging to be a project in the solutions
* Minor changes to the physical directory structure