Adding multiple transports support & other fixes:

- Avoid polling when only one input channel is used.
 - Send only handles for shared memory transport.
 - Avoid waiting in the rate logger thread when nothing to log.
 - Hide warnings from generated files
 - Fix #483

fairmq/nanomsg/FairMQMessageNN.cxx

@@ -22,6 +22,8 @@
 
 using namespace std;
 
+static FairMQ::Transport gTransportType = FairMQ::Transport::NN;
+
 string FairMQMessageNN::fDeviceID = string();
 
 FairMQMessageNN::FairMQMessageNN()
@@ -145,6 +147,11 @@ void FairMQMessageNN::SetDeviceId(const string& deviceId)
     fDeviceID = deviceId;
 }
 
+FairMQ::Transport FairMQMessageNN::GetType() const
+{
+    return gTransportType;
+}
+
 void FairMQMessageNN::Copy(const unique_ptr<FairMQMessage>& msg)
 {
     if (fMessage)