make environment config protected members, resolves #285

include/inja/environment.hpp

@@ -20,14 +20,14 @@ namespace inja {
  * \brief Class for changing the configuration.
  */
 class Environment {
-  LexerConfig lexer_config;
-  ParserConfig parser_config;
-  RenderConfig render_config;
-
   FunctionStorage function_storage;
   TemplateStorage template_storage;
 
 protected:
+  LexerConfig lexer_config;
+  ParserConfig parser_config;
+  RenderConfig render_config;
+
   std::string input_path;
   std::string output_path;