added padding to welcome message
tweaked place_ship instructions for better semantics
refactored column method to be more terse
made AI a tiny bit smarter by being reactive to multiple hits
Merge branch 'master' of https://github.com/MissAndry/ruby-battleship into pair-missandry
Merge branch 'master' of https://github.com/MissAndry/ruby-battleship into pair-missandry
moved 'row' and 'column' from Game class to Board class
refactored board functionality in game class - #board.board is now just #board