Push version.

Merge pull request #30 from flightaware/Tcl_Event_Cleanup

Tcl event cleanup

Document topic-creator commands.

Update to release 2.3.0

Update version to 2.2.1

Merge pull request #22 from flightaware/newconsumer

Implement new consumer API

Update documentation for the API change.

Merge pull request #15 from flightaware/nxt-167

Patch to allow kafkatcl 1.5 code to work in kafkatcl 2.x.

Add a note about version compatibility.

Version bump to 1.5.