Add marshalling functions for gob

This removes a lot of the boilerplate code that comes with
(un)marshalling to gob encoding in Go.

gobmarsh/marshal.go

@@ -0,0 +1,20 @@
+package gobmarsh
+
+import (
+	"bytes"
+	"encoding/gob"
+)
+
+func Marshal(v interface{}) ([]byte, error) {
+	b := new(bytes.Buffer)
+	err := gob.NewEncoder(b).Encode(v)
+	if err != nil {
+		return nil, err
+	}
+	return b.Bytes(), nil
+}
+
+func Unmarshal(data []byte, v interface{}) error {
+	b := bytes.NewBuffer(data)
+	return gob.NewDecoder(b).Decode(v)
+}