More sorting by Unicode version

This is the most convenient way to browse scripts.
diff --git a/src/hb-common.cc b/src/hb-common.cc
index e003c09..8737934 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -1,6 +1,6 @@
 /*
  * Copyright © 2009,2010  Red Hat, Inc.
- * Copyright © 2011  Google, Inc.
+ * Copyright © 2011,2012  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *