Adds step names to Approvals.Net file names, so you can have multiple asserts in one unit test

ApprovalNameEnhancer.cs

	public class ApprovalNameEnhancer : SpecFixtureBase
	{
		public override void StepSetup(Step step)
		{
			//tack the step description onto the approval file name:
			NamerFactory.AdditionalInformation = step.Description;

			//ok, but what if the step used twice in the same spec (with the same arguments)?
			var dupes = step.Spec.Steps.Where(x => x.Description == step.Description);
			var index = dupes.ToList().IndexOf(step);
			if (index > 0)
			{
				NamerFactory.AdditionalInformation += string.Format("#{0}", index + 1);
			}
		}
	}

Usage: new Spec("blah").WithFixture<ApprovalNameEnhancer>()