Issue 70: Portable library project has some invalid Nunit-based code.
Issue 70: Portable library project has some invalid Nunit-based code.

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