Autofac updates

- Updated 4.0 build to latest 3.0.2 release. Autofac no longer supports .NET 3.5, so RSB 3.5 build needs to stay at 2.6.x version for now. (when it's no longer compatible we can split off an Autofac2Builder, or something along those lines)
- Fix for registering message modules under Autofac as they were not being registered correctly