Add (optional) Google Protocol Buffers support (example in Tutorial 3).

To use protobuf, run cmake as follows:
cmake -DUSE_PROTOBUF=1 ..
For this, protobuf library has to be installed on the system.

Further changes:
Clean up splitter/merger: default are N-to-1-merger and 1-to-N-splitter.
Fix bug in nanomsg message deallocation.
Setup proper buffer sizes for nanomsg/zeromq via cmake/bash script.
chmod +x for start scripts.

fairmq/FairMQBenchmarkSampler.cxx

@@ -39,13 +39,13 @@ void FairMQBenchmarkSampler::Run()
   boost::thread resetEventCounter(boost::bind(&FairMQBenchmarkSampler::ResetEventCounter, this));
 
   void* buffer = operator new[](fEventSize);
-  FairMQMessage* base_event = fTransportFactory->CreateMessage(buffer, fEventSize);
+  FairMQMessage* base_msg = fTransportFactory->CreateMessage(buffer, fEventSize);
 
   while ( fState == RUNNING ) {
-    FairMQMessage* event = fTransportFactory->CreateMessage();
-    event->Copy(base_event);
+    FairMQMessage* msg = fTransportFactory->CreateMessage();
+    msg->Copy(base_msg);
 
-    fPayloadOutputs->at(0)->Send(event);
+    fPayloadOutputs->at(0)->Send(msg);
 
     --fEventCounter;
 
@@ -53,10 +53,10 @@ void FairMQBenchmarkSampler::Run()
       boost::this_thread::sleep(boost::posix_time::milliseconds(1));
     }
 
-    delete event;
+    delete msg;
   }
 
-  delete base_event;
+  delete base_msg;
 
   rateLogger.interrupt();
   resetEventCounter.interrupt();