Pulled Approve method to base type

This is a generic-use method and it belongs in the base type.
Windsor tests will be using it too.

Author: kkozmic

ConventionTests/ConventionTests.NUnit.cs

@@ -81,6 +81,12 @@ public virtual string Name
 		}
 
 		public abstract void Execute();
+
+		protected void Approve(string message)
+		{
+			Approvals.Verify(new ApprovalTextWriter(message), new ConventionTestNamer(GetType().Name),
+			                 Approvals.GetReporter());
+		}
 	}
 
 	/// <summary>
@@ -131,12 +137,6 @@ protected virtual Assembly[] GetAssembliesToScan(ConventionData data)
 		/// <returns> </returns>
 		protected abstract ConventionData SetUp();
 
-		private void Approve(string message)
-		{
-			Approvals.Verify(new ApprovalTextWriter(message), new ConventionTestNamer(GetType().Name),
-			                 Approvals.GetReporter());
-		}
-
 		protected virtual Type[] GetTypesToTest(ConventionData data)
 		{
 			return