Merge pull request #44 from miniway/master

fix constant collision between jzmq and czmq
converted asyncsrv guide example to use the org.zeromq packaged code, and updated for the slightly different API.
Merge pull request #45 from jkwatson/asyncsrv_fix

converted asyncsrv guide example to use the org.zeromq packaged code
rewrite poller as it compatile with jzmq