Implemented lua, shaking out latent bugs

libmap/region_pager_api.cpp

@@ -104,6 +104,8 @@ static int unloadRegion(lua_State* L) {
 	return 0;
 }
 
+//TODO: check that parameters are not null
+
 static int setOnLoad(lua_State* L) {
 	RegionPagerLua* pager = reinterpret_cast<RegionPagerLua*>(lua_touserdata(L, 1));
 	luaL_unref(L, LUA_REGISTRYINDEX, pager->GetLoadReference());