Add place_ship method to board.rb
Refactor shipsection to follow [y,x] coordinate convention set in Board class. We find this convention more intuitive when dealing with 2D arrays.
Merge branch 'master' of https://github.com/jindai1783/Battleships
Merge branch 'master' of https://github.com/ptolemybarnes/battleships
 Refactor shipsection to follow [y,x] coordinate convention set in Board class (cont.)
Merge branch 'master' of https://github.com/ptolemybarnes/battleships
Players can set coordinates