OpenConferenceWare: Added a new group, shipping stable releases, logging changes

[Igal Koshevoy]

OpenConferenceWare has grown up a lot since the codebase that I started
in late 2007 for supporting Ignite Portland. It's now supporting Open
Source Bridge, Linux Plumbers Conference and hopefully more conferences
and events in the future. I also want it to get back to it's
OpenProposals roots and be able to support Ignite-like events again,
rather than managing two forks of common codebase.

If you're interested in developing or using the software, please join
the dedicated mailing list at
http://groups.google.com/group/openconferenceware

I'll still send Bridge related updates to this list, but for nitty
gritty, the new list will be more appropriate.

I've also begun publishing a "stable" branch which has a reference to
the latest stable release. I'm also providing tags that identify a
specific release based on timestamp, e.g. "r20090416T1034". I've also
begun to populate the CHANGES.txt file to describe releases.

-igal