Removed stl node, which was from the old-api but never deleted

include/yaml-cpp/stlnode.h

-#ifndef STLNODE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
-#define STLNODE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
-
-#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
-#pragma once
-#endif
-
-
-#include <vector>
-#include <map>
-
-namespace YAML
-{
-	template <typename T>
-	void operator >> (const Node& node, std::vector<T>& v)
-	{
-		v.clear();
-		v.resize(node.size());
-		for(unsigned i=0;i<node.size();++i)
-			node[i] >> v[i];
-	}
-	
-	
-	template <typename K, typename V>
-	void operator >> (const Node& node, std::map<K, V>& m)
-	{
-		m.clear();
-		for(Iterator it=node.begin();it!=node.end();++it) {
-			K k;
-			V v;
-			it.first() >> k;
-			it.second() >> v;
-			m[k] = v;
-		}
-	}
-}
-
-#endif // STLNODE_H_62B23520_7C8E_11DE_8A39_0800200C9A66