Merge pull request #189 from jyurdal/master

Add XPUB_NODROP socket option

Author: aboseley

azmq/socket.hpp

@@ -69,6 +69,7 @@ class socket :
     using router_handover = opt::boolean<ZMQ_ROUTER_HANDOVER>;
     using probe_router = opt::boolean<ZMQ_PROBE_ROUTER>;
     using xpub_verbose = opt::boolean<ZMQ_XPUB_VERBOSE>;
+    using xpub_nodrop = opt::integer<ZMQ_XPUB_NODROP>;
     using req_correlate = opt::boolean<ZMQ_REQ_CORRELATE>;
     using req_relaxed = opt::boolean<ZMQ_REQ_RELAXED>;
     using last_endpoint = opt::binary<ZMQ_LAST_ENDPOINT>;