Maxcube Binding updates to allow sending of updates to Cube

This pull request contains the updates for Max! cube binding that allow at least radio thermostats to be updated. I've been using this for a few weeks now and it seems to work well.

One caveat is that you need to rate limit sending requests - see issue https://github.com/aheil/openhab/issues/4

Andreas (@aheil) may wish to comment on this as well before merge.

(Not sure what those merges are about - though they seem to be have no impact on the diffs)