Add serialization method (stringify) for GWT overlay types

[GoogleCodeExporter]

This was suggested on the google groups.
The compiler option "generate_stringify_method" would enable it.

Original issue reported on code.google.com by david.yu...@gmail.com on 8 May 2010 at 3:50

[GoogleCodeExporter]

Done. rev 679

Original comment by david.yu...@gmail.com on 8 May 2010 at 5:35

• Changed title: Add serialization (optional) of GWT overlay types (stringify/toJSON)
• Changed state: Fixed

[GoogleCodeExporter]

(update) rev 684
stringify will always be generated by default.
If use_global_json is used and not in dev_mode, the generated code will 
basically
delegate to the $wnd.JSON.stringify

Original comment by david.yu...@gmail.com on 10 May 2010 at 9:37

• Changed title: Add serialization method (stringify) for GWT overlay types