FairMQ Examples cleanup

- Rename Tutorial3 MQ files for uniform naming.
  - Add search for dylib in FindDDS.cmake (OSX).
  - Add more detail to the DDS example readme.
  - MQ Example 3 (DDS): choose network interface via command line option.
  - Give FairMQ examples their own CMakeLists.txt for clarity.
  - Remove C++11 checks in Tutorial3 from the code (they are now in CMake).
  - Add Serializer for device properties (FairMQDevice::ListProperties()).

fairmq/FairMQConfigurable.h

@@ -31,6 +31,8 @@ class FairMQConfigurable
     virtual std::string GetProperty(const int key, const std::string& default_ = "");
     virtual void SetProperty(const int key, const int value);
     virtual int GetProperty(const int key, const int default_ = 0);
+
+    virtual std::string GetPropertyDescription(const int key);
 };
 
 #endif /* FAIRMQCONFIGURABLE_H_ */