Added basic board and node functionality
Renamed OthelloBoard to RectangularBoard. Also renamed OthelloBoardFactory to BoardFactory
Fixed according the meeting about the Board/Node. Now Node is not immutable anymore. Board constructs its own Nodes and stores it in a one dimensional list´.
Now using assertTrue and assertFalse for boolean asserts.
Updated docs about author and responsibility of board classes
Refactored playerID to playerId
Merge pull request #2 from wnr/basic-board-functionality

Added basic board and node functionality