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/prototest/FairMQBinSink.h

@@ -0,0 +1,30 @@
+/**
+ * FairMQBinSink.h
+ *
+ * @since 2013-01-09
+ * @author D. Klein, A. Rybalchenko
+ */
+
+#ifndef FAIRMQPROTOSINK_H_
+#define FAIRMQPROTOSINK_H_
+
+#include "FairMQDevice.h"
+
+struct Content {
+  double a;
+  double b;
+  int x;
+  int y;
+  int z;
+};
+
+class FairMQBinSink: public FairMQDevice
+{
+  public:
+    FairMQBinSink();
+    virtual ~FairMQBinSink();
+  protected:
+    virtual void Run();
+};
+
+#endif /* FAIRMQPROTOSINK_H_ */