fix JSON stringify to escape special characters

When converting from non string types the converted string was not escaped

JSON/src/Stringifier.cpp

@@ -55,15 +55,11 @@ void Stringifier::stringify(const Var& any, std::ostream& out, unsigned int inde
 	{
 		out << "null";
 	}
-	else if ( any.isString() )
+	else
 	{
 		std::string value = any.convert<std::string>();
 		formatString(value, out);
 	}
-	else
-	{
-		out << any.convert<std::string>();
-	}
 }