[sugar] Chat 39 released

[Morgan Collett]

I have uploaded a new release of Chat to:

http://dev.laptop.org/pub/sugar/sources/chat-activity/chat-activity-39.tar.bz2
http://dev.laptop.org/~morgan/bundles/Chat-39.xo

This release contains:

* ACK received messages (cassidy)
* Handle pending messages when setting the message handler (cassidy)

These changes make the handling of messages more reliable.

Regards
Morgan