libel with zeromq

1. Example copy from http://pastebin.com/bNWw77ER
2. Copyright is belong to Alessandro Ghedini <al3xbio@gmail.com>
3. Interesting “THE BEER-WARE LICENSE”
4. Code uses old zeromq, add #if ZMQ_VERSION_MAJOR == 2 to distinguish
zmq_recv/zmq_recvmsg and zmq_send/zmq_sendmsg
5. TODO: modify code with libuv