Removed unneeded usings.

src/Generator/Driver.cs

@@ -1,11 +1,8 @@
-using System.Reflection;
-using Cxxi.Generators;
+using Cxxi.Generators;
 using Cxxi.Passes;
 using Cxxi.Types;
-using Mono.Options;
 using System;
 using System.Collections.Generic;
-using System.IO;
 
 namespace Cxxi
 {