Replace Protocol::File and Protocol::Directory with signle class Protocol::Node.
Remove pure virtual Response::operator ().
Remove "override" specifier from ErrorResponse::operator().
Implement ReadDirectoryResponse.
Add address member to Request and Response classes plus some getters.
Updare readDirectoryResponse, ReadDirectoryRequest and ErrorResponse due to changes in Respone and Request.
Add support for fuse_chan*, fuse_session* and GIOChannel* in std::unique_ptr<>.
Introduce VirtualFileSystem stub.