Fixed bug in XmlSerializer. IEnumerables are now serialized and deserialized correctly;
Added tests for XmlSerializer;
Fixed bug in RemoteMethodCall: The method's parameters were added to the method call's root element instead of the Parameters element;
Removed XmlHelperBase, moved validation code to Serializable;
All classes currently offering validation now derive from this class;
Implemented xml validation for RemoteError, RemoteMethodCall and RemoteMethodResponse.