Broadcasting without timeout

New API functions introduced in this release:

• group.Broadcast() for broadcasts without timeout
• group.BroadcastFor() for broadcasts with timeouts.
• new group.Close() for immediate closing of the broadcasting.

Call without timeout resolves problem explained in #4. Old Broadcasting() call saved for API backward compatibility.

Thank @matthewmcneely for code fixes.

Race fix

Bugfix release. No API changes.

• Fixed races in Join/Close (#2 by argami)

First release

Nothing new since rc just a first release with stable API.

candidate to first release

v.1.0-rc

Added ability to send broadcast to whole group (not only mesage from …