Battleships: updated readme
Merge pull request #11 from babelberry/ship

Battleships: updated readme
Merge branch 'game' of https://github.com/babelberry/Battleships into battleships
moved create ships to Game
moved create ships to Game
Battleship challenge: added grid file to development branch
Battleship challenge: removed board and board spec
replaced board by grid, modified Game initialize with player and grid