Added free Clone() function for Nodes

include/yaml-cpp/node/impl.h

@@ -224,7 +224,7 @@ namespace YAML
 		m_pMemory->merge(*rhs.m_pMemory);
 		m_pNode = rhs.m_pNode;
 	}
-
+    
 	// size/iterator
 	inline std::size_t Node::size() const
 	{

include/yaml-cpp/node/node.h

@@ -56,7 +56,7 @@ namespace YAML
 		bool is(const Node& rhs) const;
 		template<typename T> Node& operator=(const T& rhs);
 		Node& operator=(const Node& rhs);
-
+        
 		// size/iterator
 		std::size_t size() const;
 
@@ -105,6 +105,8 @@ namespace YAML
 	};
 
 	bool operator==(const Node& lhs, const Node& rhs);
+    
+    Node Clone(const Node& node);
 	
 	template<typename T>
 	struct convert;