Reworked the AutoFixture.NUnit2 to use LocalAddin

Inlight of my recent finding [here](http://gertjvr.wordpress.com/2013/10/02/howto-get-autofixture-nunit2-working-with-ncrunch/), this solution removes the need to copy any dlls, it will create a LocalAddin.cs in the installed test assembly.

Because the Addin is loaded in adhoc the resharper fix is also not needed anymore. this resolve #188