write tests for GameEngine::Cache#clear_game_state method and update test for save_game_state
add clear_game_state method to cache
comment out some of the old Javascript code temporarily
add poll route to GamesController to update game state
add polling route for games to routes.rb
modify view to display game_state object and rename div to "game-container"
add pollServer() function to JS to update the player's view periodically
ensure that the pollServer() function only loads on the game page and insert the function call inside check match to ensure that the other player gets an updated view as well