rename init and shutdown with create and destroy in LuaEnvironment

src/Device.cpp

@@ -171,7 +171,7 @@ void Device::shutdown()
 	Log::i("Releasing LuaEnvironment...");
 	if (m_lua_environment)
 	{
-		m_lua_environment->shutdown();
+		m_lua_environment->destroy();
 		
 		CE_DELETE(m_allocator, m_lua_environment);
 	}
@@ -473,7 +473,7 @@ void Device::create_lua_environment()
 
 	m_lua_environment = CE_NEW(m_allocator, LuaEnvironment)(L);
 
-	m_lua_environment->init();
+	m_lua_environment->create();
 
 	Log::d("Lua environment created.");
 }

src/Game.cpp

@@ -34,8 +34,10 @@ void frame(float dt)
 {
 	LuaEnvironment* env = device()->lua_environment();
 
+	LuaStack stack(env->state());
+
 	env->get_global_symbol("frame");
-	env->stack().push_float(dt);
+	stack.push_float(dt);
 	env->execute(1, 0);
 }