New statistic system. Now player have more informations on their board
- Players can now see ranking table, global ranking table, player of the
  month and so on
- Adding slider library (Owl carousel) to display ranking and stats
- Player can see stats of other players !
- Updating sql. game_periods table has a new field to store player score
- Updating info page
- Improve statistics performance with phpfastcache cache library