Moved the GitVersion.CommandLine reference to the unit test project
Moved the nunit command back into the Makefile and explicitly specify the runtime version
Use nunit-console.exe from the NUnit.Runners NuGet referenced package
No need to install nunit-console when we use the one from NuGet
Removed extraenous space
Fixed typo in test fixture name
The ToString_StringIsEqualTo_ExceptionToString test can't succeed on Mono since the stack trace looks very different there.
We only get 1 stack frame in release builds
Explicitly add files even though NuGet complains, so we get PDBs and .NET 4.0 files.
Upgraded from v1.7.2 to v1.8.0 of NSubstitute