Added explicit conversion from an iterator value to a Node. This conversion...

Added explicit conversion from an iterator value to a Node. This conversion was always allowed (since the iterator value is derived from Node, but since Node has a templated constructor, that would take precedence over the derived-to-base conversion. This didn't seem to be a problem in gcc or clang, but MSVC seems to have trouble. (new API)

include/yaml-cpp/node/impl.h

@@ -29,6 +29,10 @@ namespace YAML
 		Assign(rhs);
 	}
 	
+    inline Node::Node(const detail::iterator_value& rhs): m_pMemory(rhs.m_pMemory), m_pNode(rhs.m_pNode)
+    {
+    }
+
 	inline Node::Node(const Node& rhs): m_pMemory(rhs.m_pMemory), m_pNode(rhs.m_pNode)
 	{
 	}

include/yaml-cpp/node/node.h

@@ -26,6 +26,7 @@ namespace YAML
 		Node();
 		explicit Node(NodeType::value type);
 		template<typename T> explicit Node(const T& rhs);
+        explicit Node(const detail::iterator_value& rhs);
 		Node(const Node& rhs);
 		~Node();