* create a game_action_log database table and use it to store
  historical information about (for now) attacks and rounds that end
* use action_log information to generate messages to the active
  player about their recent actions (replacing game->message where
  appropriate)
* display five most recent actions at the footer of each game page
* database schema changes for game_action_log
Merge branch 'master' of github.com:buttonmen-dev/buttonmen into 99-endofround
* fix: there's no need to save entries in so many different places,
  just do it in save_game at the same time as everything else gets
  saved
Merge pull request #168 from cgolubi1/99-endofround

display end of round score and winner to both players, and also display other game data