Issue #43: Fix to correct identical 'umbrella_classname' options from trying to write to the same filename.
Issue #43: Fix to correct identical 'umbrella_classname' options from trying to write to the same filename.

happydpc/protobuf-csharp-port,happydpc/protobuf-csharp-port,evgenekov/protobuf-csharp-port,plutoo/protobuf-csharp-port,plutoo/protobuf-csharp-port,happydpc/protobuf-csharp-port,evgenekov/protobuf-csharp-port,plutoo/protobuf-csharp-port,evgenekov/protobuf-csharp-port,evgenekov/protobuf-csharp-port,happydpc/protobuf-csharp-port,plutoo/protobuf-csharp-port