Update Moq to version 4.1

Hi Remo,

I've updated the Moq package to the latest 4.1 today.  I also updated the FluentAssertions dependency to use the NuGet package.

Can you push this update to NuGet as we want to update our solution to to the latest Moq, but we are blocked at the moment by Ninject.MockingKernel.Moq.

Thanks,
Kevin