Serializating the Tag structure (#47)

closes #46

v5/marshaling.go

@@ -0,0 +1,7 @@
+package v5
+
+import "encoding/json"
+
+func (t Tag) MarshalJSON() ([]byte, error) {
+	return json.Marshal(t.Name)
+}

v5/marshaling_test.go

@@ -0,0 +1,24 @@
+package v5
+
+import (
+	"encoding/json"
+	"reflect"
+	"testing"
+)
+
+func TestTag_MarshalJSON(t *testing.T) {
+	tags := []Tag{
+		{"first", "#3e89b6", false},
+		{"second", "#ffa654", false},
+	}
+	names := []byte(`["first","second"]`)
+	str, err := json.Marshal(tags)
+
+	if err != nil {
+		t.Errorf("%v", err.Error())
+	}
+
+	if !reflect.DeepEqual(str, names) {
+		t.Errorf("Marshaled: %#v\nExpected: %#v\n", str, names)
+	}
+}