Add DealerToRouter test
Add bind/connect to both push and pull sockets
Dealer-Router are bidirectional
first cut at a Poller API.  feedback is requested!
msreader guide example
rrbroker/client/worker example from the guide + support code for it.
stub for the msgqueue guide example. on hold until we have zmq_proxy.
printlns for debugging the broken build
trying empty byte array
one more try at fixing
more debug stuff
trying something else
flailing around
taskwork2/tasksink2 from the guide
seeing if switching to the snapshot build of jzmq helps with the broken build.
reverted the code to what it was previously.  If the test is still broken, I'll @Ignore it for now.
added a test which sends a blank frame with SEND_MORE to see if that's what's broken in the build server.
Update to latest jzmq to fix build
Revert SocketType to it's previous version

The reason is because we intend on becoming the API for more than one implementation of ZMTP.