title: Custom serialization/deserialization methods in protobuf-net
body: <p>Is it possible to supply your own methods for serializing and deserializing a type for protobuf-net to use in its' Serializer.Serialize() and Serializer.Deserialize() methods?</p>
  
  <p>i.e. Write my own code using ProtoWriter and ProtoReader, instead of marking up the class with serialization attributes.</p>