Get codebase ready for actually supporting versioning.

utils/tests/pub/version_test.dart

Index: utils/tests/pub/version_test.dart
diff --git a/utils/tests/pub/version_test.dart b/utils/tests/pub/version_test.dart
index 8ff317cd5f20c8c8195760d80a646b6a323a0a51..9ace7aee1ec4f1a82e2bb77aafe89f739293adfa 100644
--- a/utils/tests/pub/version_test.dart
+++ b/utils/tests/pub/version_test.dart
@@ -9,6 +9,10 @@
 
 main() {
   group('Version', () {
+    test('none', () {
+      expect(Version.none.toString()).equals('0.0.0');
+    });
+
     group('constructor', () {
       test('throws on negative numbers', () {
         throwsIllegalArg(() => new Version(-1, 1, 1));