Closes #13 - Clients now register in zookeeper as transactors.  

Pull request for #13
If the Transactor process pauses (like java gc or swap) then zookeeper may delete the ephemeral node, however the process is still running.   Need to determine what happens in this case and come up w/ a strategy for handling it.

Also need to determine what happens when all of the zk servers go down and come back up.  Will the ephemeral node still be there?