Update the Mercurial ignore file for Roslyn.
Update the Mercurial ignore file for Roslyn.

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