Makes NCrunch able to run tests

Possible fix for #299

I got the same issue as @TeaDrivenDev but not the same problem as @forki, but this causes all unit tests to be runnable via NCrunch. I disabled running the integration tests because it doesn't seem like NCrunch supports those HostType tests.

If @forki is still getting this issue according to this post [Assemblies referenced from build output](http://forum.ncrunch.net/yaf_postst974_Assemblies-are-being-referenced-from-the-build-output-directory-of-other-projects-in-this-solution.aspx), clearing all the build output directories completely and building from scratch might fix that.