Define ratePotition
Define calculateRatings
Define chooseMoveByAI
Add space to #log moves
Rename - setUpControlsToChooseMoveByHuman
Take "player" to setUpControlsToChooseMoveByHuman
Rename chooseMove as updateScreenByMove
Take player and move to updateScreenByMove
Take player and move to showGameStatus
Log each move
chooseMoveByAI for other players
Define aiLevel
Define limitGameTreeDepth
limitGameTreeDepth to chooseMoveByAI

To avoid resource exhaustion by exploreing a full game tree.
Merge branch 'implement-simple-ai'

Close gh-2.